Fixed duplicate tokens in app titles

no issue
- the `Settings - Apps` part of the title is already set via the `settings` route

ghost/admin/app/routes/settings/apps/amp.js

@@ -2,7 +2,7 @@ import AuthenticatedRoute from 'ghost-admin/routes/authenticated';
 import styleBody from 'ghost-admin/mixins/style-body';
 
 export default AuthenticatedRoute.extend(styleBody, {
-    titleToken: 'Settings - Apps - AMP',
+    titleToken: 'AMP',
 
     classNames: ['settings-view-apps-amp'],
 

ghost/admin/app/routes/settings/apps/slack.js

@@ -5,7 +5,7 @@ import {inject as service} from '@ember/service';
 export default AuthenticatedRoute.extend(styleBody, {
     settings: service(),
 
-    titleToken: 'Settings - Apps - Slack',
+    titleToken: 'Slack',
 
     classNames: ['settings-view-apps-slack'],
 

ghost/admin/app/routes/settings/apps/unsplash.js

@@ -7,7 +7,7 @@ export default AuthenticatedRoute.extend(styleBody, {
     config: service(),
     settings: service(),
 
-    titleToken: 'Settings - Apps - Unsplash',
+    titleToken: 'Unsplash',
     classNames: ['settings-view-apps-unsplash'],
 
     beforeModel() {