Wrong package name in the ng-add schematic to replace ngrx-data

[timdeschryver]

Minimal reproduction of the bug/regression with instructions:

Create a new application, install ngrx-data, run ng add @ngrx/data --beta --migrateNgrxData

Expected behavior:

It should replace the ngrx-data to @ngrx/data in the package.json but this isn't the case.

Versions of NgRx, Angular, Node, affected browser(s) and operating system(s):

v8-beta.1

Other information:

In order to solve this we should change the following lines:

https://github.com/ngrx/platform/blob/master/modules/data/schematics/ng-add/index.ts#L96

After this step we should probably also fix the failing tests 😃
Run npm run test:unit to run the unit tests.

I would be willing to submit a PR to fix this issue

[ ] Yes (Assistance is provided if you need help submitting a pull request)
[ ] No