Add pg_logging_init() calls missing in commit ba3e6e2bca

As noticed by Michael Paquier.

src/test/modules/test_json_parser/test_json_parser_incremental.c

@@ -89,6 +89,8 @@ main(int argc, char **argv)
 	int			c;
 	bool		need_strings = false;
 
+	pg_logging_init(argv[0]);
+
 	while ((c = getopt(argc, argv, "c:s")) != -1)
 	{
 		switch (c)

src/test/modules/test_json_parser/test_json_parser_perf.c

@@ -43,6 +43,8 @@ main(int argc, char **argv)
 	int			iter;
 	int			use_inc = 0;
 
+	pg_logging_init(argv[0]);
+
 	initStringInfo(&json);
 
 	if (strcmp(argv[1], "-i") == 0)