Add test for the spawner when controller_type parameter is used

[destogl]

Background

Check the PR #957 where this functionality was not working.
We should have a test for it in the controller_manager/test/test_spawner_unspawner.cpp.
The file needs to be checked if this case is tested and if not add test for it. You can also check if other paramters from spawner are already tested and if not try to test them.

Have a fun!

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[Nils-ChristianIseke]

See #1160 As far as i get it the test for the type parameter is already implemented.
I am planning to write the tests for all parameters. So Feedback on my PR would be quiet helpful.