Remove the "enable widgets" preference properly

779a6aed2c89b17ee11e59710434dac31dfbd7ec removed this preference in
favor of a switch in the CM lock screen section, but failed to do so for
all lock screen types. Remove the broken preference from every possible
lock type to avoid confusing a lot of people (i.e. me) with a broken
toggle.

Change-Id: Ib1544cd5dcccb77a8f7a70b820035cf16cf43589

Conflicts:

	res/xml/security_settings_chooser.xml
settings: lockscreen widgets (2/2)

see fb commit for more details

Change-Id: Ia8c365121c5f2fda92080b67717f50de25beb9bc