Fix indentation that could mask a future bug

Michael Paquier, spotted using Coverity

src/backend/utils/adt/ruleutils.c

@@ -2364,7 +2364,7 @@ print_function_trftypes(StringInfo buf, HeapTuple proctup)
 		{
 			if (i != 0)
 				appendStringInfoString(buf, ", ");
-				appendStringInfo(buf, "FOR TYPE %s", format_type_be(trftypes[i]));
+			appendStringInfo(buf, "FOR TYPE %s", format_type_be(trftypes[i]));
 		}
 	}
 }