🩹(frontend) fix horizontal scroll issue

Oooopsie while merging chat, I forgot to test horizontal scrolling.
It ended up creating a scroll issue. Fixed!

This fix might create a new issue for mobile users, I'll refactor
their layout ASAP.

src/frontend/src/features/rooms/livekit/prefabs/VideoConference.tsx

@@ -149,7 +149,13 @@ export function VideoConference({ ...props }: VideoConferenceProps) {
   const { isSidePanelOpen } = useSidePanel()
 
   return (
-    <div className="lk-video-conference" {...props}>
+    <div
+      className="lk-video-conference"
+      {...props}
+      style={{
+        overflowX: 'hidden',
+      }}
+    >
       {isWeb() && (
         <LayoutContextProvider
           value={layoutContext}