Removed deubugging print satement from NoEffect class

[jmafoster1]

Forgot to remove this before #353 was merged in.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	33		0	0.94s
✅ PYTHON	pylint	33		0	5.57s

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.27%. Comparing base (aa74852) to head (20aace7).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #355      +/-   ##
==========================================
- Coverage   96.27%   96.27%   -0.01%     
==========================================
  Files          28       28              
  Lines        1586     1584       -2     
==========================================
- Hits         1527     1525       -2     
  Misses         59       59              

Files with missing lines	Coverage Δ
causal_testing/testing/causal_effect.py	98.55% <100.00%> (-0.05%)	⬇️
causal_testing/testing/metamorphic_relation.py	100.00% <100.00%> (ø)

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