fix: 'display and animations' FC

-Seems like there was an incorrect operator on line 51 in
ScreenAndAnimations.java. Also added additional null checks
incase preference screen is removed

-Seems like a typo in beanstalk_interface_settings.xml?

Change-Id: Ia8052bfac213297b82a8d28d5f5e7cc4b1880cbc