The `Config` object specific to the `google_assistant` component
had a default value for `allow_unlock`. We were not overriding this
default when constructing the Config object during `google_assistant`
component setup, whereas we do when setting up the `cloud` component.
To fix, we thread the `allow_unlock` parameter down through http setup,
and ensure that it's set correctly. Moreover, we also change the
ordering of the `Config` parameters, and remove the default. Future
refactoring should not miss it, as it is now a required parameter.
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