fix adaboost structural test

[rpreen]

Fixes #315 by setting the numpy random number seed before calling the adaboost structural test.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.63%. Comparing base (6ebf5a0) to head (e04260f).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #318   +/-   ##
=======================================
  Coverage   99.63%   99.63%           
=======================================
  Files          38       38           
  Lines        4668     4670    +2     
=======================================
+ Hits         4651     4653    +2     
  Misses         17       17           

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