Hide NPM Scripts Explorer

Previously the builtin "NPM Script Explorer" was hidden by default,
but as of VS Code 1.37 (1) it has been enabled by default because
regarding to the release notes it was "difficult to discover".

References:
  (1) https://code.visualstudio.com/updates/v1_37#_npm-scripts-explorer-visible-by-default

Resolves GH-214

snowblocks/visual-studio-code/settings.json

@@ -42,6 +42,7 @@
   },
   "files.eol": "\n",
   "files.insertFinalNewline": true,
+  "npm.enableScriptExplorer": false,
   "problems.autoReveal": false,
   "search.collapseResults": "alwaysCollapse",
   "search.useGlobalIgnoreFiles": true,