fix(@angular/build): remove default for unit-test coverage option #667

Job	Run time
build	26s
lint	2m 4s
build-e2e-windows	23s
e2e-windows	-1s
test	0s
publish-snapshots	0s
e2e-package-managers	0s
Browser Compatibility Tests	0s
e2e-snapshots	0s
e2e	0s
	2m 52s

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