Fix correct_cable_len default

[PyxieLouStar]

The expected behavior is for mwa_corr_fits to have the default setting correct_cable_len=True but instead the default is `correct_cable_len=None". This pull request fixes the default setting.

Description

A test is also added to test that all three corrections--cable length, digital gains, and polyphase filter bank bandpass--are applied by default by read_mwa_corr_fits.

Motivation and Context

In transitioning the default behavior of correct_cable_len=False to a new default of correct_cable_len=True, there was an intermediate stage in which correct_cable_len was set as None with handling later in the code. Inadvertently, during the transition process the default incorrectly became correct_cable_len=None.

closes #1418

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation change (documentation changes only)
• Version change
• Build or continuous integration change

Checklist:

• I have read the contribution guide.
• My code follows the code style of this project.

Bug fix checklist:

• My fix includes a new test that breaks as a result of the bug (if possible).
• All new and existing tests pass.
• I have updated the CHANGELOG.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.92%. Comparing base (f82e089) to head (a2fd2dd).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1419   +/-   ##
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  Coverage   99.92%   99.92%           
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  Files          37       37           
  Lines       20871    20871           
=======================================
  Hits        20855    20855           
  Misses         16       16           

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[bhazelton]

Looks great, thanks!