Replace static fixture for shortcuts_issuable_spec (!7685)

changelogs/unreleased/shortcuts-issuable-fixture.yml

+---
+title: Replace static fixture for shortcuts_issuable_spec
+merge_request: 7685
+author: winniehell

spec/javascripts/fixtures/issuable.html.haml

-%form.js-main-target-form
-  %textarea#note_note

spec/javascripts/shortcuts_issuable_spec.js

@@ -4,9 +4,11 @@
 (function() {
   describe('ShortcutsIssuable', function() {
-    fixture.preload('issuable.html');
+    var fixtureName = 'issues/open-issue.html.raw';
+    fixture.preload(fixtureName);
     beforeEach(function() {
-      fixture.load('issuable.html');
+      fixture.load(fixtureName);
+      document.querySelector('.js-new-note-form').classList.add('js-main-target-form');
       return this.shortcut = new ShortcutsIssuable();
     });
     return describe('#replyWithSelectedText', function() {