fix(angular): angular library was not checking to see if an import pa…

…th exists (nrwl#3888)

loading child paths into an angular library was not checking to see if an import path exists, so it
generated the wrong path.
the unit tests of the angular package are working. I generated a local
release with verdaccio after the correction and generated the right children path.

packages/angular/src/schematics/library/lib/add-load-children.ts

@@ -33,8 +33,8 @@ export function addLoadChildren(options: NormalizedSchema): Rule {
         sourceFile,
         `{path: '${toFileName(
           options.fileName
-        )}', loadChildren: () => import('@${npmScope}/${
-          options.projectDirectory
+        )}', loadChildren: () => import('${
+          options.importPath
         }').then(module => module.${options.moduleName})}`
       ),
     ]);