fix editor start with src and dist using es-dev-server

dist/editor/extensions/ext-polygon.js

@@ -1646,8 +1646,13 @@ function _wrapRegExp(re, groups) {
   return _wrapRegExp.apply(this, arguments);
 }
 
-var polygonIcons = "polygon-icons.svg";
-
+/**
+ * @file ext-polygon.js
+ *
+ *
+ * @copyright 2010 CloudCanvas, Inc. All rights reserved
+ *
+ */
 var extPolygon = {
   name: 'polygon',
   init: function init(S) {
@@ -1738,7 +1743,7 @@ var extPolygon = {
               */
               buttons = [{
                 id: 'tool_polygon',
-                icon: svgEditor.curConfig.extIconsPath + 'polygon.png',
+                icon: 'polygon.png',
                 type: 'mode',
                 position: 11,
                 events: {
@@ -1762,7 +1767,7 @@ var extPolygon = {
               }];
               return _context.abrupt("return", {
                 name: strings.name,
-                svgicons: svgEditor.curConfig.extIconsPath + 'polygon-icons.svg',
+                svgicons: 'polygon-icons.svg',
                 buttons: strings.buttons.map(function (button, i) {
                   return Object.assign(buttons[i], button);
                 }),