Fix NPE causing a hot reboot when pressing power button
Revert "Fix fatal exception due to missing looper for current thread."

This reverts commit 64024f22ece38920112031264533ec8367e80a40.

This was no fix - even with the NPE fixed (see commit below) the phone hot rebooted because the UI was updated from wrong thread. Reverting this commit now finally seems to fix this issue for me.