SystemUI: Remove unused string

    <string name="led_notification_title">Light settings</string>

    <string name="led_notification_text">LED light enabled by settings</string>

    <!-- Content description of the superuser tile -->

    <string name="accessibility_su_active">Superuser session active</string>

    <!-- Notification which notifies user flashlight is enabled -->

    <string name="quick_settings_tile_flashlight_not_title">Flashlight is on</string>

    <string name="quick_settings_tile_flashlight_not_summary">Tap to turn off</string>