fix(@angular/build): normalize `allowedHosts` in dev-server #1686

Job	Run time
list	31s
workflow (modules-builder-tests)	32s
workflow (build-cli)	32s
workflow (devkit-core-tests)	34s
workflow (devkit-core-tests-rerun)	31s
workflow (build-unit-tests)	33s
	3m 13s

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