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

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

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.79%. Comparing base (22cba75) to head (5337ca9).

Additional details and impacted files

```diff @@ 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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