Disables close button when page is being translated. (#421)

Co-authored-by: Abhishek Aggarwal <66322306+abhi-agg@users.noreply.github.com>

extension/view/js/translation-notification-fxtranslations.js

@@ -192,7 +192,7 @@ window.MozTranslationNotification = class extends MozElements.Notification {
         this._getAnonElt("qualityestimations-check").checked
     );
     this.state = this.translationNotificationManager.TranslationInfoBarStates.STATE_TRANSLATING;
-    this._getAnonElt("closeButton").disabled = true;
+    this._getAnonElt("closeButton").style.display = "none";
     this._getAnonElt("displayStatistics").style.display = "none";
     this._getAnonElt("aftertranslatedOptions").style.display = "block";
   }