event_queue: Pass `bool`s to `maybe_enqueue_for_message_update`.
event_queue: Pass `bool`s to `maybe_enqueue_for_message_update`.

This simplifies the logic in the function itself and makes this function
consistent with how we pass data to `maybe_enqueue_notifications`.

zulip/zulip,kou/zulip,andersk/zulip,hackerkid/zulip,andersk/zulip,punchagan/zulip,hackerkid/zulip,andersk/zulip,rht/zulip,andersk/zulip,zulip/zulip,hackerkid/zulip,punchagan/zulip,zulip/zulip,andersk/zulip,punchagan/zulip,kou/zulip,eeshangarg/zulip,eeshangarg/zulip,rht/zulip,hackerkid/zulip,kou/zulip,punchagan/zulip,kou/zulip,zulip/zulip,andersk/zulip,hackerkid/zulip,zulip/zulip,rht/zulip,kou/zulip,zulip/zulip,zulip/zulip,eeshangarg/zulip,eeshangarg/zulip,rht/zulip,punchagan/zulip,punchagan/zulip,punchagan/zulip,rht/zulip,andersk/zulip,eeshangarg/zulip,rht/zulip,kou/zulip,rht/zulip,hackerkid/zulip,eeshangarg/zulip,hackerkid/zulip,kou/zulip,eeshangarg/zulip