(maint) Update Puppet logo

This updates the extension to use the new Puppet Extension logo file

Author: jpogran

images/puppet-vscode-sm.png

@@ -13,7 +13,7 @@
   },
   "publisher": "jpogran",
   "license": "SEE LICENSE IN LICENSE.txt",
-  "icon": "images/Puppet-Logo-Amber-sm.png",
+  "icon": "images/puppet-vscode-sm.png",
   "aiKey": "147f322c-ecdc-4db2-a818-da8be01f07f5",
   "galleryBanner": {
     "color": "#000000",