Remove obsolete calls to setup_logger()

examples/injection_examples/create_your_own_source_model.py

...tion_examples/create_your_own_time_domain_source_model.py

examples/injection_examples/how_to_specify_the_prior.py

examples/injection_examples/marginalized_likelihood.py

examples/other_examples/gaussian_example.py

examples/other_examples/hyper_parameter_example.py

examples/other_examples/linear_regression.py

examples/other_examples/linear_regression_unknown_noise.py