update tests to use mock_setup_basic_transmon_with_standard_params where needed (#369, QAE-711)

Explanation of changes

We have two fixtures mock_setup_basic_transmon and mock_setup_basic_transmon_with_standard_params. Changed so that all test functions call the second fixture

Motivation of changes

Motivate why the particular solution was chosen.

(closes #369 (closed))

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