bug(schematics/ngrx): adding feature to empty module causes duplicate imports props

[jeffbcross]

Running this command on an empty NgModule caused two imports properties to be added to the NgModule decorator.

Before:

@NgModule({})
export class ContactsModule {}

Generate:

$ ng g ngrx contacts --module=libs/contacts/src/contacts.module.ts

After:

@NgModule({
  providers: [ContactsEffects]
  imports: [StoreModule.forFeature('contacts', contactsReducer, {initialState: contactsInitialState})]
  imports: [EffectsModule.forFeature([ContactsEffects])]
})

[jeffbcross]

It also didn't add a comma after providers

[vsavkin]

Duplicate of #9

[github-actions]

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