Remove the overflow menu button in fullscreen mode

It didn't work and fixing it is a bit of a project: see comment

https://github.com/vector-im/element-call/issues/807

src/room/InCallView.tsx

@@ -377,6 +377,7 @@ export function InCallView({
             onPress={toggleScreensharing}
           />
         )}
+        {!maximisedParticipant && (
           <OverflowMenu
             inCall
             roomIdOrAlias={roomIdOrAlias}
@@ -385,6 +386,7 @@ export function InCallView({
             feedbackModalState={feedbackModalState}
             feedbackModalProps={feedbackModalProps}
           />
+        )}
         <HangupButton onPress={onLeave} />
       </div>
     );