base: Remove unused strings

Change-Id: Icf1a1c50679df64cc1c79e93f20a33212436505e
Keyguard: Set WIDGET_CATEGORY_KEYGUARD when AppWidgetHostView is created

Allows the default lockscreen widget to inherit the keyguard widget
host category.  Without this, only widgets added through
KeyguardActivityLauncher are assigned the correct
OPTION_APPWIDGET_HOST_CATEGORY.

Change-Id: Ic97818d85ca5f00da0ce43bb36006d66a6935363
SystemUI: AF Translations

Change-Id: I2e641bb6d8ac4550adc2631193602128c315855c