Keydisabler: fix button light restore logic

Do not assign default button brightness if backup key is not found.
Instead do nothing. This will prevent brightness being reset to default
on boot when navbar is disabled.

If backup key is not found when actually toggling navbar then we've got
bigger problems.

Change-Id: I649bf1480a42f2cbe94d0a47a0c6055c934b4f56
Merge "Keydisabler: fix button light restore logic" into cm-11.0
Settings: Update strings related to developer options

Change-Id: I0398e22d5152c8214c44dc4b4fbf7f7932d772e1
Merge pull request #8 from CyanogenMod/cm-11.0