Fix logout not working when server offline

src/client/action/logout.js

@@ -1,13 +1,16 @@
 import initMatrix from '../initMatrix';
 
-function logout() {
+async function logout() {
   const mx = initMatrix.matrixClient;
   mx.stopClient();
-  mx.logout().then(() => {
+  try {
-    mx.clearStores();
+    await mx.logout();
-    window.localStorage.clear();
+  } catch {
-    window.location.reload();
+    // ignore if failed to logout
-  });
+  }
+  mx.clearStores();
+  window.localStorage.clear();
+  window.location.reload();
 }
 
 export default logout;