Fix Homepage layout

When the Javascript added the Copy code link, the
`govuk-summary-list__row--no-actions` class remained in place, which
left an unsightly gap on the right hand side. This updates the JS to
remove the class once we have appended the action element, meaning the
gap is no longer there

lib/engines/content_block_manager/app/assets/javascripts/content_block_manager/modules/copy-embed-code.js

@@ -13,6 +13,7 @@ window.GOVUK.Modules = window.GOVUK.Modules || {}
     dd.append(this.copyLink)
 
     this.module.append(dd)
+    this.module.classList.remove('govuk-summary-list__row--no-actions')
   }
 
   CopyEmbedCode.prototype.createLink = function () {

lib/engines/content_block_manager/spec/content_block_manager/copy-code.spec.js

@@ -29,6 +29,12 @@ describe('GOVUK.Modules.CopyEmbedCode', function () {
     expect(copyLink.textContent).toBe('Copy code')
   })
 
+  it('should remove the .govuk-summary-list__row--no-actions class', function () {
+    expect(fixture.classList).not.toContain(
+      'govuk-summary-list__row--no-actions'
+    )
+  })
+
   it('should create and populate a textarea', function () {
     window.GOVUK.triggerEvent(copyLink, 'click')