Fix font comboboxmenu can't expand and update control-center dbus x for multiple screen case
Add dbus property showInRight

tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/159b1d83ced649f28e57bc3f933e161b/

Change-Id: Id81c4d7e531a7c1550f954142b77f94576f29bc1