fix(@schematics/angular): addProviderToModule bug: add providers into inner Object

[bsdfzzzy]

Fix bug when add providers into module.

Fixes: #13080

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[ngbot]

	Artifact	Baseline	Current	Change
❕	cli/new-production/test-project/main.js	173.60KB	174.00KB	+409 bytes

[ngbot]

	Artifact	Baseline	Current	Change
❕	cli/new-production/test-project/main.js	173.60KB	174.00KB	+409 bytes

[ngbot]

	Artifact	Baseline	Current	Change
❕	cli/new-production/test-project/main.js	173.60KB	174.00KB	+409 bytes

[googlebot]

CLAs look good, thanks!

[alan-agius4]

Thanks for this.

Kindly squash your commits into a single one, and also can you kindly add a Unit Test for this?

[bsdfzzzy]

@alan-agius4 Thanks for checking! I adopted your suggestions and updated this pr.

[alan-agius4]

LGTM, thanks

[alan-agius4]

@bsdfzzzy can you please fix the commit msg as you have a typo?

Thanks

[bsdfzzzy]

@alan-agius4 emmm...Which one please...

[alan-agius4]

with ut should be with it

[bsdfzzzy]

@alan-agius4 emmm... I mean Unit Test.

[bsdfzzzy]

@alan-agius4 By the way, could you tell me when can this issue be solved if you know?

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