BUG: use prime dims for latent prior

[mj-will]

prep_latent_prior was incorrectly using dims when constructing the draw function. This PR changes it to use the newly introduced prime_dims which replaces rescaled_dims

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.46%. Comparing base (3a06ad6) to head (b12bcf8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #483   +/-   ##
=======================================
  Coverage   94.45%   94.46%           
=======================================
  Files          65       65           
  Lines        6823     6828    +5     
=======================================
+ Hits         6445     6450    +5     
  Misses        378      378           

Flag	Coverage Δ
unittests	94.46% <100.00%> (+<0.01%)	⬆️

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