containmentview: Remove QueuedConnection from setContainment
Queued connection here causes a race condition when restarting plasmashell and can cause it to get stuck to crash loop, since plasmashell tries to assert for panel to be visible but this slot is not even called yet, even though the signal is emitted.
(cherry picked from commit ce01af99)
5ff7251c containmentview: Remove queuedconnection from setContainment