xwayland: Change randr_output status when call xwl_output_remove()
When remove a monitor, will call xwl_output_remove(), but in this function the xwl_output->randr_output status does not changed. So when call RRTellChanged, it won't send a signal. Like Qt signal (QGuiApplication::screenRemoved) needs this signal.
Fix commit 204f10c2 ("xwayland: Call RRTellChanged if the RandR configuration may have changed")
Signed-off-by: zhoulei zhoulei@kylinos.cn Signed-off-by: Morose chenlinxiang@kylinos.cn