Revert "Stabilize output of new regression test case".

This effectively reverts commit 9edc97b7 (although the test is now
in a different place and has different contents).  We don't need that
hack anymore, because since commit 4b93f579, this test case no longer
throws an error and so there's no displayed CONTEXT that could vary
depending on CLOBBER_CACHE_ALWAYS.  The underlying unstable-output
problem isn't really gone, of course, but it no longer manifests here.

src/pl/plpgsql/src/expected/plpgsql_varprops.out

@@ -176,7 +176,6 @@ end$$;
 ERROR:  null value cannot be assigned to variable "x" declared NOT NULL
 CONTEXT:  PL/pgSQL function inline_code_block line 3 during statement block local variable initialization
 -- Check that variables are reinitialized on block re-entry.
-\set VERBOSITY terse   \\ -- needed for output stability
 do $$
 begin
   for i in 1..3 loop
@@ -210,7 +209,6 @@ NOTICE:  x = <NULL>
 NOTICE:  y = 3
 NOTICE:  r = <NULL>
 NOTICE:  c = <NULL>
-\set VERBOSITY default
 -- Check enforcement of domain constraints during initialization
 do $$
 declare x int_nn;  -- fail

src/pl/plpgsql/src/sql/plpgsql_varprops.sql

@@ -151,7 +151,6 @@ end$$;
 
 -- Check that variables are reinitialized on block re-entry.
 
-\set VERBOSITY terse   \\ -- needed for output stability
 do $$
 begin
   for i in 1..3 loop
@@ -173,7 +172,6 @@ begin
     end;
   end loop;
 end$$;
-\set VERBOSITY default
 
 -- Check enforcement of domain constraints during initialization