Update some Yarn plugins and fix bugs now detected.

src/App.tsx

@@ -47,8 +47,8 @@ const App: React.FC = () => {
     return <SessionHandler />;
   } else {
     var timeslotid: number | null = null;
-    if ("timeslot_id" in q) {
-      timeslotid = q.timeslot_id;
+    if (("timeslot_id" in q) && (typeof q.timeslot_id === "string")) {
+      timeslotid = parseInt(q.timeslot_id);
     } else if (currentTimeslot.timeslot_id != null) {
       timeslotid = currentTimeslot.timeslot_id;
     }

src/mixer/state.ts

@@ -636,12 +636,12 @@ export const setMicVolume = (level: MicVolumePresetEnum): AppThunk => (
   // processing latency
   if (levelVal !== 0) {
     dispatch(
-      mixerState.actions.setMicLevels({ volume: levelVal, gain: levelVal })
+      mixerState.actions.setMicLevels({ volume: levelVal })
     );
   } else {
     window.setTimeout(() => {
       dispatch(
-        mixerState.actions.setMicLevels({ volume: levelVal, gain: levelVal })
+        mixerState.actions.setMicLevels({ volume: levelVal })
       );
       // latency, plus a little buffer
     }, audioEngine.audioContext.baseLatency * 1000 + 150);