fix(@schematics/angular): added webWorkerTsConfig into test options

[InSantoshMahto]

I have found one issue while working with a web worker.
I have a simple web-worker and working perfectly with ng build but in the case of the ng test will fail.

after some time I found that "webWorkerTsConfig": "tsconfig.worker.json" missing in test options.

and also check --target with ng g web-worker CLI reference.

Today I have made a simple change in angular-cli so that it will also added same config into test if it available it will change.

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[alan-agius4]

Thanks for your contribution.

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