[skip modevents] reduce nEventsPerJob for mc.H7EG_jetjet_JZ9plus.py

8 jobs for patch-3 in 59 seconds
Name Stage Failure
failed
check_modified_files Check Commit
ERROR: Your commit has modified or deleted pre-existing files: 
M 830xxx/830019/mc.H7EG_jetjet_JZ9plus.py
This is not allowed!

Will now check whether files have been added in pre-existing DSID directories
OK: No file added
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit code 1