fix(spectacular): remove @angular/forms dependency

[LayZeeDK]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Build related changes
[x] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

@angular/forms and rxjs are listed as dependencies in the Spectacular bundle.

Spectacular doesn't have a dependency on @angular/forms and only uses type imports from rxjs.

Issue Number: N/A

What is the new behavior?

• @angular/forms is not listed in Spectacular's bundle.
• rxjs is listed as a peer dependency in Spectacular's bundle.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[NachoVazquez]

Why would the @angular/forms dependency be in the package.json if originally is not there?

[LayZeeDK]

ng-packagr detects a single use of @angular/forms in the tour of heroes crisis center library. Spectacular has one test which imports from that library. Apparently, it's not able to differentiate between test dependencies and runtime dependencies.