fix(@angular-devkit/build-angular): fix app-shell route format and #2976

Job	Run time
build-e2e-windows	37s
lint	2m 0s
build	28s
test	0s
Browser Compatibility Tests	0s
e2e-package-managers	0s
publish-snapshots	-1s
e2e	-1s
e2e-snapshots	-1s
e2e-windows	0s
	3m 2s

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