Also only trigger events and update the session flags
if they actually changed, as some callers might not check for differences.

Signed-off-by: Vincent Petry <vincent@nextcloud.com>

In the settings dialog there are now warnings to tell that people will
be removed from calls when either enabling the lobby or locking a
conversation.

Signed-off-by: Vincent Petry <vincent@nextcloud.com>

Only show ongoing call warnings in settings dialog when a call is
actually in progress.

Signed-off-by: Vincent Petry <vincent@nextcloud.com>