KDED: force check current config after resumed from suspend
KDED: force check current config after resumed from suspend

Some drivers fail to detect that connected monitors have changed while
the computer was suspended, and so KScreen wasn't notified. This patch
adds code to explicitly request new config from backend after resuming
from suspend to force the backend to query XRandR and thus detect the
changes and emit change events.

davidedmundson/test,davidedmundson/test,davidedmundson/test