compositor-drm: Pass the right stride to the vaapi recorder

It takes the stride in bytes, not pixels. The bug was hidden when using
va intel-driver 1.2.1 because it would ignore the stride from user and
set the surface state in a wrong way.

https://bugs.freedesktop.org/show_bug.cgi?id=77495

src/compositor-drm.c

@@ -2576,7 +2576,7 @@ recorder_frame_notify(struct wl_listener *listener, void *data)
 		return;
 	}
 
-	vaapi_recorder_frame(output->recorder, fd, output->current->stride / 4);
+	vaapi_recorder_frame(output->recorder, fd, output->current->stride);
 }
 
 static void *