Update JetTreeMark icon format from SVG to ICO

Author: HichemTab-tech

package.json

@@ -21,15 +21,15 @@
         {
           "id": "jettreemark",
           "title": "JetTreeMark",
-          "icon": "src/pluginIcon.svg"
+          "icon": "src/pluginIcon.ico"
         }
       ]
     },
     "views": {
       "jettreemark": [
         {
           "type": "webview",
-          "icon": "src/pluginIcon.svg",
+          "icon": "src/pluginIcon.ico",
           "id": "jettreemark.view",
           "name": "Tree View"
         }