Update bower dependencies, fix redraw regression

- In Mithril, `finally` has been removed from promise objects as it is not part of the ES spec. See https://gist.github.com/jish/e9bcd75e391a2b21206b for info on the substitute.
- Fix a regression introduced in e5a7013 which broke some redraws

js/forum/src/components/ForgotPasswordModal.js

@@ -91,6 +91,7 @@ export default class ForgotPasswordModal extends Modal {
         this.success = true;
         this.alert = null;
       })
-      .finally(this.loaded.bind(this));
+      .catch(() => {})
+      .then(this.loaded.bind(this));
   }
 }