fix(@angular/build): avoid extra tick in SSR dev-server builds #1907

Job	Run time
build-e2e-windows	34s
lint	2m 14s
build	33s
e2e	0s
publish-snapshots	0s
test	0s
Browser Compatibility Tests	0s
e2e-package-managers	0s
e2e-snapshots	0s
e2e-windows	0s
	3m 21s

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