Fixed the ability to return to the main post page after scheduling a post in lexical (#16970)

refs TryGhost/Team#3405
- BackgroundSave option sets post status as Draft. Don't need such
behaviour as a post already can have a different status when a user
leaves the page.

ghost/admin/app/controllers/lexical-editor.js

@@ -937,7 +937,7 @@ export default class LexicalEditorController extends Controller {
                 this.cancelAutosave();
                 this.autosaveTask.cancelAll();
             }
-            await this.autosaveTask.perform({leavingEditor: true});
+            await this.autosaveTask.perform({leavingEditor: true, backgroundSave: false});
             return transition.retry();
         }