Settings: Disable slider shortcuts with custom lockscreen

These are not available with the custom lockscreen.

Change-Id: Ib67b97b597da0cf06d9d36b4fe7b40b55d0e2425
Signed-off-by: Roman Birg <roman@cyngn.com>
Merge "Settings: Disable slider shortcuts with custom lockscreen" into cm-11.0
Merge remote-tracking branch 'cm/cm-11.0' into cm-11.0-sgt7