Fix aspnet-webpack build on machines that don't already have tsd in the node_modules dir here

Author: SteveSandersonMS

src/Microsoft.AspNetCore.SpaServices/npm/aspnet-webpack/package.json

@@ -4,7 +4,7 @@
   "description": "Helpers for using Webpack in ASP.NET Core projects. Works in conjunction with the Microsoft.AspNetCore.SpaServices NuGet package.",
   "main": "index.js",
   "scripts": {
-    "prepublish": "rimraf *.d.ts && tsd update && tsc && echo 'Finished building NPM package \"aspnet-webpack\"'",
+    "prepublish": "rimraf *.d.ts && tsc && echo 'Finished building NPM package \"aspnet-webpack\"'",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "author": "Microsoft",