Stop the ICE disconnected timer on call terminate

It just wasn't getting stopped, so if the call ended while ICE was
disconnected, we'd get confusing error messages after the call ended.

src/webrtc/call.ts

@@ -2174,6 +2174,7 @@ export class MatrixCall extends TypedEventEmitter<CallEvent, CallEventHandlerMap
         // chrome doesn't implement any of the 'onstarted' events yet
         if (["connected", "completed"].includes(this.peerConn?.iceConnectionState ?? "")) {
             clearTimeout(this.iceDisconnectedTimeout);
+            this.iceDisconnectedTimeout = undefined;
             this.state = CallState.Connected;
 
             if (!this.callLengthInterval && !this.callStartTime) {
@@ -2546,6 +2547,10 @@ export class MatrixCall extends TypedEventEmitter<CallEvent, CallEventHandlerMap
             clearTimeout(this.inviteTimeout);
             this.inviteTimeout = undefined;
         }
+        if (this.iceDisconnectedTimeout !== undefined) {
+            clearTimeout(this.iceDisconnectedTimeout);
+            this.iceDisconnectedTimeout = undefined;
+        }
         if (this.callLengthInterval) {
             clearInterval(this.callLengthInterval);
             this.callLengthInterval = undefined;