Remove the lonlat argument from ang2vec

[camposandro]

Remove the lonlat argument from the hp.ang2vec call. Depends on astronomy-commons/hats#426.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.66%. Comparing base (3b55aa9) to head (791800d).
Report is 1 commits behind head on margin.

Additional details and impacted files

@@           Coverage Diff           @@
##           margin     #504   +/-   ##
=======================================
  Coverage   97.66%   97.66%           
=======================================
  Files          39       39           
  Lines        1540     1540           
=======================================
  Hits         1504     1504           
  Misses         36       36           

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