[BUG] Use correct logout URL

- If a `logout` event is send the user should be redirected to the
homepage, there are three mechanism that can do this. The response of
`/user/logout` and the event listener of notifications or stopwatch.
It's essentially a race for what's processed first to determine which
mechanism takes care of redirecting the user.
- Fix that the redirection mechanism of the notification and stopwatch
event listener redirects to an absolute URL.
- Ref: #2135

web_src/js/features/notification.js

@@ -112,7 +112,7 @@ export function initNotificationCount() {
           type: 'close',
         });
         worker.port.close();
-        window.location.href = appSubUrl;
+        window.location.href = `${window.location.origin}${appSubUrl}/`;
       } else if (event.data.type === 'close') {
         worker.port.postMessage({
           type: 'close',

web_src/js/features/stopwatch.js

@@ -74,7 +74,7 @@ export function initStopwatch() {
           type: 'close',
         });
         worker.port.close();
-        window.location.href = appSubUrl;
+        window.location.href = `${window.location.origin}${appSubUrl}/`;
       } else if (event.data.type === 'close') {
         worker.port.postMessage({
           type: 'close',