Fix for PypeIt calibration line loading

[hpparvi]

This PR fixes Issue #227 by converting the linelist table in specreduce.calibration_data.load_pypeit_calibration_lines from a Table to a QTable before calling specutils.utils.wcs_utils.vac_to_air. The vac_to_air function requires wavelengths to be given as Quantity objects, but the line list was a Table instead of a QTable.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.36%. Comparing base (2cc466d) to head (d88f5c1).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #231      +/-   ##
==========================================
- Coverage   83.37%   83.36%   -0.02%     
==========================================
  Files          13       13              
  Lines        1137     1136       -1     
==========================================
- Hits          948      947       -1     
  Misses        189      189              

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[kecnry]

Thanks for the quick fix!