Restore dropped update of default transmission energies

[samaloney]

Accidentally removed update to default transmission energies

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.97%. Comparing base (9febb96) to head (3d7d2f1).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
stixpy/calibration/transmission.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #197   +/-   ##
=======================================
  Coverage   80.97%   80.97%           
=======================================
  Files          35       35           
  Lines        2391     2391           
=======================================
  Hits         1936     1936           
  Misses        455      455           

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