fix(@angular/cli): enable shell option for Prettier execution on Wind… #2660

Job	Run time
lint	1m 58s
build-e2e-windows	24s
build	24s
e2e-windows	0s
publish-snapshots	0s
e2e-snapshots	-1s
Browser Compatibility Tests	-1s
e2e	-1s
test	-1s
e2e-package-managers	-1s
	2m 41s

Provide feedback