fix(@schematics/angular): relative tsconfig paths in references #925

Job	Run time
list	24s
workflow (devkit-core-tests)	1m 20s
workflow (modules-builder-tests)	1m 43s
workflow (build-cli)	1m 29s
workflow (devkit-core-tests-rerun)	1m 23s
workflow (build-unit-tests)	2m 22s
	8m 41s

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