Reapply Ember 2.10 for good this time!

This reverts commit ddd299f4aaf25353cc2f47829d213623a3cf7590.

plugins/discourse-details/assets/javascripts/initializers/apply-details.js.es6

@@ -21,6 +21,7 @@ function initializeDetails(api) {
           "details_text",
           { multiline: false }
         );
+        this.set('optionsVisible', false);
       }
     }
   });