fix(@schematics/angular): include default export for Express app #532

Job	Run time
list	41s
workflow (build-cli)	2m 8s
workflow (modules-builder-tests)	2m 32s
workflow (devkit-core-tests)	1m 51s
workflow (devkit-core-tests-rerun)	1m 51s
workflow (build-unit-tests)	2m 54s
	11m 57s

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