Fix some ERFA calls

[bhazelton]

Description

Fixes some ERFA calls that were missed in #1314 for calculating apparent coordinates and add one small improvement to the ERFA LST calculation.

Motivation and Context

Fixes #1315
Fixes #1318

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

Merging #1331 (c998954) into main (4ff6808) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1331   +/-   ##
=======================================
  Coverage   99.91%   99.91%           
=======================================
  Files          36       36           
  Lines       19942    19943    +1     
=======================================
+ Hits        19926    19927    +1     
  Misses         16       16           

Files Changed	Coverage Δ
pyuvdata/utils.py	100.00% <100.00%> (ø)

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[kartographer]

Thanks @bhazelton -- all looks good to me!