wayland: demote image_description_ready log to trace

this happens on every frame

video/out/wayland_common.c

@@ -2136,7 +2136,7 @@ static void image_description_ready(void *data, struct wp_image_description_v1 *
 {
     struct vo_wayland_state *wl = data;
     wp_color_management_surface_v1_set_image_description(wl->color_surface, image_description, 0);
-    MP_VERBOSE(wl, "Image description set on color surface.\n");
+    MP_TRACE(wl, "Image description set on color surface.\n");
     wp_image_description_v1_destroy(image_description);
 }