Fix not disconnecting from livekit session. (#1920)

Signed-off-by: Timo K <toger5@hotmail.de>

src/rtcSessionHelpers.ts

@@ -15,6 +15,7 @@ limitations under the License.
 */
 
 import { MatrixRTCSession } from "matrix-js-sdk/src/matrixrtc/MatrixRTCSession";
+import { Room } from "livekit-client";
 
 import { PosthogAnalytics } from "./analytics/PosthogAnalytics";
 import { LivekitFocus } from "./livekit/LivekitFocus";
@@ -68,7 +69,9 @@ const widgetPostHangupProcedure = async (
 
 export async function leaveRTCSession(
   rtcSession: MatrixRTCSession,
+  livekitRoom: Room | undefined,
 ): Promise<void> {
+  await livekitRoom?.disconnect();
   await rtcSession.leaveRoomSession();
   if (widget) {
     await widgetPostHangupProcedure(widget);