job-manager: update commented out flag

Problem: some commented out code uses EVENT_JOURNAL_ONLY
but this flag was renamed to EVENT_NO_COMMIT.

Rename flag.

Author: garlick

src/modules/job-manager/prioritize.c

@@ -98,7 +98,7 @@ static int reprioritize_one (struct job_manager *ctx,
         && job->state != FLUX_JOB_STATE_PRIORITY
         && job->priority != FLUX_JOB_PRIORITY_MIN
         && job->priority != FLUX_JOB_PRIORITY_MAX)
-        flags = EVENT_JOURNAL_ONLY;
+        flags = EVENT_NO_COMMIT;
      */
 
     /*  Post 'priority' event.