Remove package.json prepublish task to avoid extra tsc build

Author: daviwil

package.json

@@ -45,7 +45,6 @@
     "vscode.powershell"
   ],
   "scripts": {
-    "vscode:prepublish": "tsc -p ./",
     "compile": "tsc -p ./",
     "compile-watch": "tsc -watch -p ./",
     "postinstall": "node ./node_modules/vscode/bin/install"