Fix the mute icon being incorrect when using PTT

We were manipulating the participant's mute state directly for some
reason, just for setting the mute state directly, which bypased the
mutestates hook.

src/room/InCallView.tsx

@@ -190,7 +190,8 @@ export function InCallView({
     containerRef1,
     toggleMicrophone,
     toggleCamera,
-    async (muted) => await localParticipant.setMicrophoneEnabled(!muted)
+    (muted) =>
+      muteStates?.audio?.setEnabled && muteStates.audio.setEnabled(!muted)
   );
 
   const onDisconnected = useCallback(