actions: Add appropriate argument to transaction.atomic decorators.
actions: Add appropriate argument to transaction.atomic decorators.

These were missing an argument to the decorator - and we generally want
to use either savepoint=False or durable=True.

rht/zulip,kou/zulip,andersk/zulip,andersk/zulip,andersk/zulip,rht/zulip,andersk/zulip,zulip/zulip,rht/zulip,rht/zulip,rht/zulip,rht/zulip,andersk/zulip,zulip/zulip,kou/zulip,zulip/zulip,zulip/zulip,kou/zulip,zulip/zulip,andersk/zulip,kou/zulip,kou/zulip,zulip/zulip,zulip/zulip,kou/zulip,rht/zulip,kou/zulip,andersk/zulip