Remove useless attachToDocument property

attachToDocument property is not needed

spec/frontend/diffs/components/compare_versions_spec.js

@@ -22,7 +22,6 @@ describe('CompareVersions', () => {
     store.state.diffs.diffFiles.push('test');
 
     wrapper = mount(CompareVersionsComponent, {
-      attachToDocument: true,
       localVue,
       store,
       propsData: {

spec/frontend/diffs/components/diff_file_header_spec.js

@@ -91,7 +91,6 @@ describe('DiffFileHeader component', () => {
       },
       localVue,
       store,
-      attachToDocument: true,
     });
   };
 

spec/frontend/diffs/components/diff_gutter_avatars_spec.js

@@ -16,7 +16,6 @@ describe('DiffGutterAvatars', () => {
       propsData: {
         ...props,
       },
-      attachToDocument: true,
     });
   };
 

spec/frontend/diffs/components/edit_button_spec.js

@@ -9,7 +9,6 @@ describe('EditButton', () => {
   const createComponent = (props = {}) => {
     wrapper = shallowMount(EditButton, {
       propsData: { ...props },
-      attachToDocument: true,
     });
   };