wayland: don't always use surface local coordinates in toplevel config

Since 1301fdb we try to directly use
surface local coordinates however it is valid for compositors to send us
0s in either the width or height. In that case, it means mpv should
choose its geometry so we should calculate out our own coordinates.
Previously this was incidentally handled, but we should be more explicit
here and set the bool.

Author: Dudemanguy

video/out/wayland_common.c

@@ -1936,7 +1936,7 @@ static void handle_toplevel_config(void *data, struct xdg_toplevel *toplevel,
                mp_rect_w(wl->geometry), mp_rect_h(wl->geometry));
 
     wl->pending_vo_events |= VO_EVENT_RESIZE;
-    wl->override_surface_local = false;
+    wl->override_surface_local = width == 0 || height == 0;
     wl->toplevel_configured = true;
 }