refactor(@schematics/angular): remove duplicate prompt definition. #1581

Job	Run time
list	30s
workflow (build-cli)	1m 28s
workflow (devkit-core-tests-rerun)	1m 13s
workflow (devkit-core-tests)	1m 13s
workflow (modules-builder-tests)	1m 53s
workflow (build-unit-tests)	2m 7s
	8m 24s

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