Update QS customizer add tiles string.

    <string name="right_icon">Right icon</string>

    <!-- Label for area where tiles can be dragged out of [CHAR LIMIT=60] -->

    <string name="drag_to_add_tiles">Drag to add tiles</string>

    <string name="drag_to_add_tiles">Hold and drag to add tiles</string>

    <!-- Label for area where tiles can be dragged in to [CHAR LIMIT=60] -->

    <string name="drag_to_remove_tiles">Drag here to remove</string>