fix broken module import

spec/javascripts/shortcuts_issuable_spec.js

-import '~/copy_as_gfm';
+import initCopyAsGFM from '~/behaviors/copy_as_gfm';
 import ShortcutsIssuable from '~/shortcuts_issuable';
 
+initCopyAsGFM();
+
 describe('ShortcutsIssuable', () => {
   const fixtureName = 'merge_requests/diff_comment.html.raw';
   preloadFixtures(fixtureName);