FIX: Ensure page is reloaded correctly when a hash is present (#8096)

To demonstrate the issue:
- Visit https://meta.discourse.org/#somethingHere while logged in
- Click "log out"
- You will be logged out, but the page will not be reloaded

Setting `window.location.pathname = "/"` will not reload the page if there is a hash present. Using `window.location = "/"` gives us the desired behavior.

app/assets/javascripts/admin/models/backup.js.es6

@@ -63,7 +63,7 @@ Backup.reopenClass({
         bootbox.alert(result.message);
       } else {
         // redirect to homepage (session might be lost)
-        window.location.pathname = Discourse.getURL("/");
+        window.location = Discourse.getURL("/");
       }
     });
   }