Settings: Fix possible illegal argument exception

User reported this exception during toggle settings from QS
Just check if receiver where attached before unregister them.

Change-Id: I184042bd05af28dc2ad2272fba25b650ccd2c8c1
Settings: apple can do...we can do as well

incredible apple engineers speeded up the overall UI and reduced per default slightly
the animation scales. Well we do as well and reduce it from 1 to 0.75...smooth, looks well
and does not break anything

Change-Id: Ifab9c0111429389d715319e4f272a8298c4dba80
Settings: disable keyguard widget frame (2/2)

Change-Id: I23cd62d58d345278dc2b1dbeeefd574dc313e6c1