fix(@schematics/angular): reset module `typeSeparator` when generatin… #1309

Job	Run time
list	24s
workflow (build-cli)	1m 49s
workflow (modules-builder-tests)	1m 39s
workflow (build-unit-tests)	2m 9s
workflow (devkit-core-tests)	1m 30s
workflow (devkit-core-tests-rerun)	1m 18s
	8m 49s

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