Apply corrections identified by SonarQube (#8457)

src/Lifecycle.ts

@@ -833,7 +833,7 @@ async function startMatrixClient(startSyncing = true): Promise<void> {
     }
 
     // Now that we have a MatrixClientPeg, update the Jitsi info
-    await Jitsi.getInstance().start();
+    Jitsi.getInstance().start();
 
     // dispatch that we finished starting up to wire up any other bits
     // of the matrix client that cannot be set prior to starting up.