Remove %error-verbose directive from jsonpath parser

None of the other bison parsers contains this directive, and it gives
rise to some unfortunate and impenetrable messages, so just remove it.

Backpatch to release 12, where it was introduced.

Per gripe from Erik Rijkers

Discussion: https://postgr.es/m/ba069ce2-a98f-dc70-dc17-2ccf2a9bf7c7@xs4all.nl

src/backend/utils/adt/jsonpath_gram.y

@@ -74,7 +74,6 @@ static JsonPathParseItem *makeItemLikeRegex(JsonPathParseItem *expr,
 %pure-parser
 %expect 0
 %name-prefix="jsonpath_yy"
-%error-verbose
 %parse-param {JsonPathParseResult **result}
 
 %union {

src/test/regress/expected/jsonpath.out

@@ -569,15 +569,15 @@ select '$ ? (@.a < +1)'::jsonpath;
 (1 row)
 
 select '$ ? (@.a < .1)'::jsonpath;
-ERROR:  syntax error, unexpected '.' at or near "." of jsonpath input
+ERROR:  syntax error at or near "." of jsonpath input
 LINE 1: select '$ ? (@.a < .1)'::jsonpath;
                ^
 select '$ ? (@.a < -.1)'::jsonpath;
-ERROR:  syntax error, unexpected '.' at or near "." of jsonpath input
+ERROR:  syntax error at or near "." of jsonpath input
 LINE 1: select '$ ? (@.a < -.1)'::jsonpath;
                ^
 select '$ ? (@.a < +.1)'::jsonpath;
-ERROR:  syntax error, unexpected '.' at or near "." of jsonpath input
+ERROR:  syntax error at or near "." of jsonpath input
 LINE 1: select '$ ? (@.a < +.1)'::jsonpath;
                ^
 select '$ ? (@.a < 0.1)'::jsonpath;
@@ -635,15 +635,15 @@ select '$ ? (@.a < +1e1)'::jsonpath;
 (1 row)
 
 select '$ ? (@.a < .1e1)'::jsonpath;
-ERROR:  syntax error, unexpected '.' at or near "." of jsonpath input
+ERROR:  syntax error at or near "." of jsonpath input
 LINE 1: select '$ ? (@.a < .1e1)'::jsonpath;
                ^
 select '$ ? (@.a < -.1e1)'::jsonpath;
-ERROR:  syntax error, unexpected '.' at or near "." of jsonpath input
+ERROR:  syntax error at or near "." of jsonpath input
 LINE 1: select '$ ? (@.a < -.1e1)'::jsonpath;
                ^
 select '$ ? (@.a < +.1e1)'::jsonpath;
-ERROR:  syntax error, unexpected '.' at or near "." of jsonpath input
+ERROR:  syntax error at or near "." of jsonpath input
 LINE 1: select '$ ? (@.a < +.1e1)'::jsonpath;
                ^
 select '$ ? (@.a < 0.1e1)'::jsonpath;
@@ -701,15 +701,15 @@ select '$ ? (@.a < +1e-1)'::jsonpath;
 (1 row)
 
 select '$ ? (@.a < .1e-1)'::jsonpath;
-ERROR:  syntax error, unexpected '.' at or near "." of jsonpath input
+ERROR:  syntax error at or near "." of jsonpath input
 LINE 1: select '$ ? (@.a < .1e-1)'::jsonpath;
                ^
 select '$ ? (@.a < -.1e-1)'::jsonpath;
-ERROR:  syntax error, unexpected '.' at or near "." of jsonpath input
+ERROR:  syntax error at or near "." of jsonpath input
 LINE 1: select '$ ? (@.a < -.1e-1)'::jsonpath;
                ^
 select '$ ? (@.a < +.1e-1)'::jsonpath;
-ERROR:  syntax error, unexpected '.' at or near "." of jsonpath input
+ERROR:  syntax error at or near "." of jsonpath input
 LINE 1: select '$ ? (@.a < +.1e-1)'::jsonpath;
                ^
 select '$ ? (@.a < 0.1e-1)'::jsonpath;
@@ -767,15 +767,15 @@ select '$ ? (@.a < +1e+1)'::jsonpath;
 (1 row)
 
 select '$ ? (@.a < .1e+1)'::jsonpath;
-ERROR:  syntax error, unexpected '.' at or near "." of jsonpath input
+ERROR:  syntax error at or near "." of jsonpath input
 LINE 1: select '$ ? (@.a < .1e+1)'::jsonpath;
                ^
 select '$ ? (@.a < -.1e+1)'::jsonpath;
-ERROR:  syntax error, unexpected '.' at or near "." of jsonpath input
+ERROR:  syntax error at or near "." of jsonpath input
 LINE 1: select '$ ? (@.a < -.1e+1)'::jsonpath;
                ^
 select '$ ? (@.a < +.1e+1)'::jsonpath;
-ERROR:  syntax error, unexpected '.' at or near "." of jsonpath input
+ERROR:  syntax error at or near "." of jsonpath input
 LINE 1: select '$ ? (@.a < +.1e+1)'::jsonpath;
                ^
 select '$ ? (@.a < 0.1e+1)'::jsonpath;
@@ -821,7 +821,7 @@ select '0'::jsonpath;
 (1 row)
 
 select '00'::jsonpath;
-ERROR:  syntax error, unexpected IDENT_P at end of jsonpath input
+ERROR:  syntax error at end of jsonpath input
 LINE 1: select '00'::jsonpath;
                ^
 select '0.0'::jsonpath;
@@ -947,18 +947,18 @@ select '(1.2).e3'::jsonpath;
 (1 row)
 
 select '1..e'::jsonpath;
-ERROR:  syntax error, unexpected '.' at or near "." of jsonpath input
+ERROR:  syntax error at or near "." of jsonpath input
 LINE 1: select '1..e'::jsonpath;
                ^
 select '1..e3'::jsonpath;
-ERROR:  syntax error, unexpected '.' at or near "." of jsonpath input
+ERROR:  syntax error at or near "." of jsonpath input
 LINE 1: select '1..e3'::jsonpath;
                ^
 select '(1.).e'::jsonpath;
-ERROR:  syntax error, unexpected ')' at or near ")" of jsonpath input
+ERROR:  syntax error at or near ")" of jsonpath input
 LINE 1: select '(1.).e'::jsonpath;
                ^
 select '(1.).e3'::jsonpath;
-ERROR:  syntax error, unexpected ')' at or near ")" of jsonpath input
+ERROR:  syntax error at or near ")" of jsonpath input
 LINE 1: select '(1.).e3'::jsonpath;
                ^