Update regression error message for NUMERIC range overflow. Display "1"

instead of "10^0".

src/test/regress/expected/numeric.out

@@ -688,12 +688,12 @@ INSERT INTO fract_only VALUES (1, '0.0');
 INSERT INTO fract_only VALUES (2, '0.1');
 INSERT INTO fract_only VALUES (3, '1.0');	-- should fail
 ERROR:  numeric field overflow
-DETAIL:  The absolute value is greater than or equal to 10^0 for field with precision 4, scale 4.
+DETAIL:  A field with precision 4, scale 4 must have an absolute value less than 1.
 INSERT INTO fract_only VALUES (4, '-0.9999');
 INSERT INTO fract_only VALUES (5, '0.99994');
 INSERT INTO fract_only VALUES (6, '0.99995');  -- should fail
 ERROR:  numeric field overflow
-DETAIL:  The absolute value is greater than or equal to 10^0 for field with precision 4, scale 4.
+DETAIL:  A field with precision 4, scale 4 must have an absolute value less than 1.
 INSERT INTO fract_only VALUES (7, '0.00001');
 INSERT INTO fract_only VALUES (8, '0.00017');
 SELECT * FROM fract_only;