[Mondrian] testAllowsGroupingSets in mondrian.test.DialectTest.java - postgres fix

[Ati Rosselet]

testAllowsGroupingSets() missing error for postgres since we still have no
grouping sets in 8.2 (maybe 8.3 has it.. who knows)

301+            // postgres
302+            "ERROR: syntax error at or near \"SETS\""

Cheers
Ati
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