Fixed deprecated access of `controller.{currentPath,currentRouteName}`

no issue

- replaced access of `controller.{currentPath,currentRouteName}` with `router.currentRouteName`
- https://deprecations.emberjs.com/v3.x/#toc_application-controller-router-properties

app/controllers/application.js

@@ -5,23 +5,26 @@ import {inject as service} from '@ember/service';
 
 export default Controller.extend({
     dropdown: service(),
+    router: service(),
     session: service(),
     settings: service(),
     ui: service(),
 
-    showNavMenu: computed('currentPath', 'session.{isAuthenticated,user.isFulfilled}', 'ui.isFullScreen', function () {
+    showNavMenu: computed('router.currentRouteName', 'session.{isAuthenticated,user.isFulfilled}', 'ui.isFullScreen', function () {
+        let {router, session, ui} = this;
+
         // if we're in fullscreen mode don't show the nav menu
-        if (this.ui.isFullScreen) {
+        if (ui.isFullScreen) {
             return false;
         }
 
         // we need to defer showing the navigation menu until the session.user
         // promise has fulfilled so that gh-user-can-admin has the correct data
-        if (!this.get('session.isAuthenticated') || !this.get('session.user.isFulfilled')) {
+        if (!session.isAuthenticated || !session.user.isFulfilled) {
             return false;
         }
 
-        return (this.currentPath !== 'error404' || this.get('session.isAuthenticated'))
-                && !this.currentPath.match(/(signin|signup|setup|reset)/);
+        return (router.currentRouteName !== 'error404' || session.isAuthenticated)
+                && !router.currentRouteName.match(/(signin|signup|setup|reset)/);
     })
 });

app/controllers/settings/tags/tag.js

@@ -4,9 +4,9 @@ import {alias} from '@ember/object/computed';
 import {inject as service} from '@ember/service';
 
 export default Controller.extend({
-    applicationController: controller('application'),
     tagsController: controller('settings.tags'),
     notifications: service(),
+    router: service(),
 
     showDeleteTagModal: false,
 
@@ -77,7 +77,7 @@ export default Controller.extend({
     },
 
     _deleteTagSuccess() {
-        let currentRoute = this.get('applicationController.currentRouteName') || '';
+        let currentRoute = this.router.currentRouteName || '';
 
         if (currentRoute.match(/^settings\.tags/)) {
             this.transitionToRoute('settings.tags.index');

app/controllers/setup.js

@@ -1,17 +1,17 @@
 /* eslint-disable ghost/ember/alias-model-in-controller */
-import Controller, {inject as controller} from '@ember/controller';
+import Controller from '@ember/controller';
 import {computed} from '@ember/object';
 import {match} from '@ember/object/computed';
 import {inject as service} from '@ember/service';
 
 export default Controller.extend({
-    appController: controller('application'),
     ghostPaths: service(),
+    router: service(),
 
-    showBackLink: match('appController.currentRouteName', /^setup\.(two|three)$/),
+    showBackLink: match('router.currentRouteName', /^setup\.(two|three)$/),
 
-    backRoute: computed('appController.currentRouteName', function () {
-        let currentRoute = this.get('appController.currentRouteName');
+    backRoute: computed('router.currentRouteName', function () {
+        let currentRoute = this.router.currentRouteName;
 
         return currentRoute === 'setup.two' ? 'setup.one' : 'setup.two';
     })