Extend Blackbody wavelength range to cover all filters

[oczoske]

The wavelength range for the WCU black-body source now extends from !SIM.spectral.wave_min to wave_max. These values are set in the irdb mode yaml and should encompass all filters available in the mode.

Closes #871

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.83%. Comparing base (1c88878) to head (43d6249).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #872      +/-   ##
==========================================
- Coverage   74.88%   74.83%   -0.06%     
==========================================
  Files          69       69              
  Lines        8870     8868       -2     
==========================================
- Hits         6642     6636       -6     
- Misses       2228     2232       +4     

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[teutoburg]

See individual comment. Otherwise good 👍

Why not just remove the old code instead of commenting it out? But whatever...