Adding dashes for passing arguments to scripts

Adding some missing dashes required to pass the configuration in the right way to "development configurations in package.json. Otherwise Unknown command or entry development  is thrown
---
Close #1624

package.json

@@ -661,9 +661,9 @@
  "package": "vsce package --out vscode-edge-devtools.vsix",
  "vscode:prepublish": "npm run build && npm run lint",
  "build": "webpack",
- "build-debug": "npm run build --mode development --env debug",
+ "build-debug": "npm run build -- --mode development --env debug",
  "build-edge-watch": "npm run build-debug -- --env devtoolsBaseUri=http://localhost:3000/vscode_app.html",
- "build-watch": "npm run build --mode development && npm run watch",
+ "build-watch": "npm run build -- --mode development && npm run watch",
  "build-and-lint": "npm run build && npm run lint",
  "watch": "npm run watch-wp",
  "watch-wp": "webpack --watch",