[EMCAL-539] Fix in trigger simulation to not accept every event as MB

[jokonig]

• Only events where EMCal is triggered should be given the trigger flag. This was previously not the case

[github-actions]

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[jokonig]

@shahor02 could you have a look at this PR? This is needed for an issue discovered in the pp ref. MC (https://its.cern.ch/jira/browse/O2-5670)