fix(@angular/cli): remove @angular-devkit/build-ng-packagr from packageGroup

This package is no longer released.

(cherry picked from commit e84e517)

Author: alan-agius4

packages/angular/cli/package.json

@@ -51,7 +51,6 @@
     "packageGroup": {
       "@angular/cli": "0.0.0",
       "@angular-devkit/build-angular": "0.0.0",
-      "@angular-devkit/build-ng-packagr": "0.0.0",
       "@angular-devkit/build-webpack": "0.0.0",
       "@angular-devkit/core": "0.0.0",
       "@angular-devkit/schematics": "0.0.0"