Fix component test using deprecated `.state`

Hey @kimroen not sure if you have a way to sync blueprints from ember-cli or we need to fix them on a case-by-case basis? If you have a sync setup then they just need to be re-synced. Otherwise this changes just the component test blueprint to fix a deprecated warning but i notice that some other blueprints are outdated as well.

Fix:
`_state` instead of `state`