refactor: reviewer's comments

- don't pass `closeAccountMenu` to AccountMenu, instead create it in Account menu state and use it
- add event observers as per original code
- move some variables into component's state (even if they don't need to have setters sometimes)

app/assets/javascripts/views/footer/footer-view.pug

@@ -17,7 +17,6 @@
           app-state='ctrl.appState'
           application='ctrl.application'
           ng-if='ctrl.showAccountMenu',
-          close-account-menu='ctrl.closeAccountMenu()',
         )
       .sk-app-bar-item
         a.no-decoration.sk-label.title(