Remove unused __main__ block in tests

[Sparks29032]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.04%. Comparing base (b350d85) to head (234a268).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #222      +/-   ##
==========================================
+ Coverage   97.58%   99.04%   +1.45%     
==========================================
  Files          21       21              
  Lines        1078     1048      -30     
==========================================
- Hits         1052     1038      -14     
+ Misses         26       10      -16     

Files with missing lines	Coverage Δ
tests/test_morphapp.py	100.00% <ø> (+0.73%)	⬆️
tests/test_morphchain.py	100.00% <ø> (+3.03%)	⬆️
tests/test_morphpdftordf.py	100.00% <ø> (+4.00%)	⬆️
tests/test_morphpy.py	100.00% <ø> (+1.16%)	⬆️
tests/test_morphrdftopdf.py	100.00% <ø> (+4.00%)	⬆️
tests/test_morphresolution.py	100.00% <ø> (+4.16%)	⬆️
tests/test_morphrgrid.py	100.00% <ø> (+1.66%)	⬆️
tests/test_morphscale.py	100.00% <ø> (+4.34%)	⬆️
tests/test_morphshape.py	98.59% <ø> (+2.64%)	⬆️
tests/test_morphshift.py	100.00% <ø> (+3.84%)	⬆️
... and 4 more

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