Do not enable Camera widget on non-camera devices

Change-Id: Ib8b945aaf23ecaaf70e6d8ca466d54d97f9982a0
SoundSettings: Assigning a null to an unnecessary variable

Change-Id: Ic8c3e6ff66cc888f6069e3bbef666ede3c56dc13
 Settings: Lockscreen custom wallpaper (2/2)