bugfix: regression in mentions logic concerning the interaction of DND state, 1on1 and multiple mentions (that the original patches reverted were supposed to resolve)
bugfix: regression in mentions logic concerning the interaction of DND state, 1on1 and multiple mentions (that the original patches reverted were supposed to resolve)

jhonnyam123/hangoutsbot,cd334/hangoutsbot,makiftasova/hangoutsbot