Added logout in loading screen

Signed-off-by: Ajay Bura <ajbura@gmail.com>

src/client/action/logout.js

@@ -2,6 +2,7 @@ import initMatrix from '../initMatrix';
 
 function logout() {
   const mx = initMatrix.matrixClient;
+  mx.stopClient();
   mx.logout().then(() => {
     mx.clearStores();
     window.localStorage.clear();