🐛(frontend) fix effect menu scroll

Since refactoring, the effect side panel, was not scrollable anymore.
Fixed it.

src/frontend/src/features/rooms/livekit/components/effects/Effects.tsx

@@ -13,6 +13,7 @@ export const Effects = () => {
     <div
       className={css({
         padding: '0 1.5rem',
+        overflowY: 'scroll',
       })}
     >
       <EffectsConfiguration