Settings: fix NPE in ButtonSettings

Change-Id: Ib2ab4d7d5ed3aaceeba8fe942b7a29cd01f003fb
Lowercase to uppercase

http://i.imgur.com/xdt0REV.jpg

Change-Id: I2e8b7f606a0c82bc448a07a28829203c96e1d5a3
Merge remote-tracking branch 'cyanogen/cm-12.0' into HEAD