Fixes a few issues with the lens mask since migrating it into its own
module:
- The module didn't provide itself as the container and hence the
feature was accessing the same properties on the device.
- `enabled` getter on the module incorrect but not picked up due to the
previous issue.
- No `REQUIRED_COMPONENT` set to ensure the module only created if
available.
Also changes attribute names to `enabled` from `state` to avoid
confusion with device states.