fixed alpha bug

[jmafoster1]

Confidence interval alpha wasn't being passed into IPCW estimator. Now it is.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	30		0	1.03s
✅ PYTHON	pylint	30		0	5.0s

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.55%. Comparing base (e6284c5) to head (4d11764).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #291   +/-   ##
=======================================
  Coverage   95.55%   95.55%           
=======================================
  Files          23       23           
  Lines        1666     1666           
=======================================
  Hits         1592     1592           
  Misses         74       74           

Files	Coverage Δ
...sal_testing/surrogate/causal_surrogate_assisted.py	100.00% <100.00%> (ø)
causal_testing/testing/estimators.py	92.28% <100.00%> (ø)

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[f-allian]

All good