pargen: calibration routines fixes

[ggmarshall]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 65.57377% with 42 lines in your changes missing coverage. Please review.

Project coverage is 48.82%. Comparing base (0b46fc8) to head (0639677).
Report is 6 commits behind head on main.

Files	Patch %	Lines
src/pygama/pargen/energy_cal.py	60.49%	32 Missing ⚠️
src/pygama/pargen/AoE_cal.py	76.92%	9 Missing ⚠️
src/pygama/math/functions/hpge_peak.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #583      +/-   ##
==========================================
+ Coverage   48.60%   48.82%   +0.22%     
==========================================
  Files          59       59              
  Lines        7754     7846      +92     
==========================================
+ Hits         3769     3831      +62     
- Misses       3985     4015      +30     

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