chore: fix for missing redirects on `@nativescript/angular`

[DickSmith]

PR Checklist

• [x] The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/CONTRIBUTING.md#commit-messages.
• [x] There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
• [x] You have signed the CLA.
• [x] All existing tests are passing: https://github.com/NativeScript/nativescript-dev-webpack/blob/master/CONTRIBUTING.md#testing-locally-by-running-e2e-tests
• [ ] Tests for the changes are included.

What is the current behavior?

ERROR in __REDACTED__/node_modules/@nstudio/nativescript-checkbox/angular/index.js
Module not found: Error: Can't resolve 'nativescript-angular/forms/value-accessors/base-value-accessor' in '__REDACTED__/node_modules/@nstudio/nativescript-checkbox/angular'

ERROR in __REDACTED__/node_modules/nativescript-drop-down/angular/index.js
Module not found: Error: Can't resolve 'nativescript-angular/forms/value-accessors/base-value-accessor' in '__REDACTED__/node_modules/nativescript-drop-down/angular'

ERROR in __REDACTED__/node_modules/@nstudio/nativescript-checkbox/angular/index.js
Module not found: Error: Can't resolve 'nativescript-angular/lang-facade' in '__REDACTED__node_modules/@nstudio/nativescript-checkbox/angular'

What is the new behavior?

From what I've seen for the @nativescript/angular package, all mappings should be 1-1 anyway, so this should work, any exceptions to that assumption can also be remapped here for the specific cases. Fixes/Implements/Closes: https://github.com/nstudio/nativescript-checkbox/issues/118 https://github.com/PeterStaev/NativeScript-Drop-Down/issues/229

[rosen-vladimirov]

Closing as the suggested changes were already merged in this PR Thanks for the great idea @DickSmith