Use the same .reset as RoomViewStore

src/stores/SessionStore.js

@@ -16,6 +16,10 @@ limitations under the License.
 import dis from '../dispatcher';
 import {Store} from 'flux/utils';
 
+const INITIAL_STATE = {
+    cachedPassword: localStorage.getItem('mx_pass'),
+};
+
 /**
  * A class for storing application state to do with the session. This is a simple flux
  * store that listens for actions and updates its state accordingly, informing any
@@ -33,9 +37,7 @@ class SessionStore extends Store {
         super(dis);
 
         // Initialise state
-        this._state = {
-            cachedPassword: localStorage.getItem('mx_pass'),
-        };
+        this._state = INITIAL_STATE;
     }
 
     _update() {
@@ -67,11 +69,13 @@ class SessionStore extends Store {
                 });
                 break;
             case 'on_logged_out':
-                this._state = {
-                    cachedPassword: null,
-                };
+                this.reset();
                 break;
         }
+
+        reset() {
+            this._state = Object.assign({}, INITIAL_STATE);
+        }
     }
 
     getCachedPassword() {