Avoid using ambiguous word "positive" in error message.

There are two identical error messages about valid value of modulus for
hash partition, in PostgreSQL source code. Commit 0e1275fb07 improved
only one of them so that ambiguous word "positive" was avoided there,
and forgot to improve the other. This commit improves the other.
Which would reduce translator burden.

Back-pach to v11 where the error message exists.

Author: Kyotaro Horiguchi
Reviewed-by: Fujii Masao
Discussion: https://postgr.es/m/20210819.170315.1413060634876301811.horikyota.ntt@gmail.com

src/backend/parser/parse_utilcmd.c

@@ -4036,7 +4036,7 @@ transformPartitionBound(ParseState *pstate, Relation parent,
 		if (spec->modulus <= 0)
 			ereport(ERROR,
 					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
-					 errmsg("modulus for hash partition must be a positive integer")));
+					 errmsg("modulus for hash partition must be an integer value greater than zero")));
 
 		Assert(spec->remainder >= 0);
 

src/test/regress/expected/alter_table.out

@@ -4109,7 +4109,7 @@ ALTER TABLE hash_parted ATTACH PARTITION hpart_5 FOR VALUES WITH (MODULUS 4, REM
 -- check that the table being attach is with valid modulus and remainder value
 CREATE TABLE fail_part(LIKE hash_parted);
 ALTER TABLE hash_parted ATTACH PARTITION fail_part FOR VALUES WITH (MODULUS 0, REMAINDER 1);
-ERROR:  modulus for hash partition must be a positive integer
+ERROR:  modulus for hash partition must be an integer value greater than zero
 ALTER TABLE hash_parted ATTACH PARTITION fail_part FOR VALUES WITH (MODULUS 8, REMAINDER 8);
 ERROR:  remainder for hash partition must be less than modulus
 ALTER TABLE hash_parted ATTACH PARTITION fail_part FOR VALUES WITH (MODULUS 3, REMAINDER 2);

src/test/regress/expected/create_table.out

@@ -934,7 +934,7 @@ LINE 1: ...LE fail_part PARTITION OF hash_parted2 FOR VALUES WITH (MODU...
                                                              ^
 -- modulus must be greater than zero
 CREATE TABLE fail_part PARTITION OF hash_parted2 FOR VALUES WITH (MODULUS 0, REMAINDER 1);
-ERROR:  modulus for hash partition must be a positive integer
+ERROR:  modulus for hash partition must be an integer value greater than zero
 -- remainder must be greater than or equal to zero and less than modulus
 CREATE TABLE fail_part PARTITION OF hash_parted2 FOR VALUES WITH (MODULUS 8, REMAINDER 8);
 ERROR:  remainder for hash partition must be less than modulus