await leave rtc session (#1648)

so that the widget is only getting the hangup even,
once the call has been cleaned up

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

src/rtcSessionHelpers.ts

@@ -47,7 +47,9 @@ export function enterRTCSession(rtcSession: MatrixRTCSession) {
   rtcSession.joinRoomSession([makeFocus(livekitAlias)]);
 }
 
-export function leaveRTCSession(rtcSession: MatrixRTCSession) {
+export async function leaveRTCSession(
+  rtcSession: MatrixRTCSession
+): Promise<void> {
   //groupCallOTelMembership?.onLeaveCall();
-  rtcSession.leaveRoomSession();
+  await rtcSession.leaveRoomSession();
 }