Fix Bug #55095 innodb_file_format_check: no warning for illegal value

rb://397 approved by Sunny Bains

mysql-test/suite/rpl/t/rpl_sync-slave.opt

---sync-relay-log-info=1 --relay-log-recovery=1 --innodb_file_format_check='ON'
+--sync-relay-log-info=1 --relay-log-recovery=1 --innodb_file_format_check=1

storage/innobase/handler/ha_innodb.cc

@@ -10833,7 +10833,7 @@ by the server. Can be set during server startup at command
 line or configure file, and a read only variable after
 server startup */
 static MYSQL_SYSVAR_BOOL(file_format_check, innobase_file_format_check,
-  PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_READONLY,
+  PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
   "Whether to perform system file format check.",
   NULL, NULL, TRUE);