[Sprint/GiddyGiraffe] (fix): banning does not stop users from commenting on group activities

Marcelo Riverarequested to merge
eiennohi/engine:sprint/GiddyGiraffe.fix.dont-allow-commenting-on-activities-from-groups-youre-not-an-owner-of into master

closes front#1354 (closed)

Edited by Marcelo Rivera

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