Only specify the astropy table columns once.

[delucchi-cmu]

Change Description

Closes #335 .

When passing read_columns (as in the mapping stage), do not attempt to further limit the columns read from the fits file.

Code Quality

• I have read the Contribution Guide and LINCC Frameworks Code of Conduct
• My code follows the code style of this project
• My code builds (or compiles) cleanly without any errors or warnings
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.79%. Comparing base (22cba75) to head (5337ca9).
Report is 39 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #336   +/-   ##
=======================================
  Coverage   99.79%   99.79%           
=======================================
  Files          26       26           
  Lines        1442     1442           
=======================================
  Hits         1439     1439           
  Misses          3        3           

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[hombit]

Looks good!