Fix no-undef linter errors

Author: basil

plugin/src/main/js/snippets/workflow.js

@@ -1,3 +1,4 @@
+import ace from "ace-builds/src-noconflict/ace";
 ace.define("ace/snippets/groovy",["require","exports","module"], function(require, exports, module) {
 "use strict";
 

plugin/src/main/js/workflow-editor.js

@@ -6,7 +6,7 @@ import 'jquery-ui/ui/widgets/resizable';
 import { addSamplesWidget } from './samples';
 
 // Import ACE
-import "ace-builds/src-noconflict/ace";
+import ace from "ace-builds/src-noconflict/ace";
 import "ace-builds/src-noconflict/ext-language_tools";
 import "ace-builds/src-noconflict/mode-groovy";
 import "ace-builds/src-noconflict/theme-tomorrow";