Properly pick the output when setting it inactive.
This bug caused serious problems together with NVIDIA multi-screen setups(In my case, the panel disappeared): When an additional screen was added, the output was added here and set active, but when it was removed again, the output was not set inactive, which made the output-logic combine both screens into one bigger screen with wrong, larger, size.
git-svn-id: svn+ssh://svn.kde.org/home/kde/trunk/KDE/kdebase@913095 283d02a7-25f6-0310-bc7c-ecb5cbfe19da