TWAS ensemble fixes

[danielnachun]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 82.85714% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.23%. Comparing base (326fc90) to head (6d46455).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
R/twas_weights.R	86.00%	7 Missing ⚠️
R/regularized_regression.R	70.58%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #490      +/-   ##
==========================================
- Coverage   82.55%   82.23%   -0.32%     
==========================================
  Files          36       36              
  Lines        7748     7830      +82     
==========================================
+ Hits         6396     6439      +43     
- Misses       1352     1391      +39     

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