fix(@schematics/angular): remove setting files tsconfig field with SS… #918

Job	Run time
list	25s
workflow (build-cli)	1m 29s
workflow (modules-builder-tests)	1m 44s
workflow (build-unit-tests)	2m 6s
workflow (devkit-core-tests-rerun)	1m 21s
workflow (devkit-core-tests)	1m 15s
	8m 20s

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