Use useLayoutEffect for Bubble

useEffect causes an annoying flickering effect on changing
the bubble position that seems to be avoided by useLayoutEffect.

Thanks @mwiencek for the suggestion.

Author: reosarevok

root/static/scripts/common/components/Bubble.js

@@ -52,7 +52,7 @@ component Bubble(
     },
   });
 
-  React.useEffect(() => {
+  React.useLayoutEffect(() => {
     refs.setReference(controlRef.current);
   }, [controlRef, refs]);