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

dist/editor/extensions/ext-helloworld.js

@@ -1683,13 +1683,13 @@ var extHelloworld = {
                 name: strings.name,
                 // For more notes on how to make an icon file, see the source of
                 // the helloworld-icon.xml
-                svgicons: svgEditor.curConfig.extIconsPath + 'helloworld-icon.xml',
+                svgicons: 'helloworld-icon.xml',
                 // Multiple buttons can be added in this array
                 buttons: [{
                   // Must match the icon ID in helloworld-icon.xml
                   id: 'hello_world',
                   // Fallback, e.g., for `file:///` access
-                  icon: svgEditor.curConfig.extIconsPath + 'helloworld.png',
+                  icon: 'helloworld.png',
                   // This indicates that the button will be added to the "mode"
                   // button panel on the left side
                   type: 'mode',