broadway: Move window position ownership to browser

With this we always roundtrip position change to the webbrowser.
This avoids conflicts when things change from both directions (app and user).

Also, we fake configure evens when there is no web client to ensure
apps get the events.

gdk/broadway/gdkbroadway-server.h

@@ -62,6 +62,7 @@ void               _gdk_broadway_server_window_update            (GdkBroadwaySer
 								  cairo_surface_t    *surface);
 gboolean           _gdk_broadway_server_window_move_resize       (GdkBroadwayServer  *server,
 								  gint                id,
+								  gboolean            with_move,
 								  int                 x,
 								  int                 y,
 								  int                 width,