fix failing logger tests

[sduquemesa]

Context: Tests in test_logger.py fail locally when running pytest directly.

Description of the Change: This PR solves the failing tests by

• fixing the failing stream assertion on test_default_sf_logger,
• by setting the level of the root logger instead of the module logger on test_custom_logger_before_sf_logger_with_higher_level.

Additional to the above, some unused arguments on test functions were removed.

Benefits: Logger test no longer fail when using pytest directly.

Possible Drawbacks: None

Related GitHub Issues: None

[codecov[bot]]

Codecov Report

Merging #675 (5228354) into master (2d6e3ea) will increase coverage by 0.04%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #675      +/-   ##
==========================================
+ Coverage   98.29%   98.33%   +0.04%     
==========================================
  Files          75       75              
  Lines        9036     9036              
==========================================
+ Hits         8882     8886       +4     
+ Misses        154      150       -4     

Impacted Files	Coverage Δ
strawberryfields/logger.py	100.00% <0.00%> (+16.66%)	:arrow_up:

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