Fix allpars for zerocorr

[palday]

Closes #569

There seems to be a new issue in the docs when predict is called on a model with a function term (e.g. division) in the response. For now, I've just made a work-around.

[codecov]

Codecov Report

Merging #570 (8030e83) into main (1636e65) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #570      +/-   ##
==========================================
+ Coverage   96.16%   96.24%   +0.08%     
==========================================
  Files          28       28              
  Lines        2500     2503       +3     
==========================================
+ Hits         2404     2409       +5     
+ Misses         96       94       -2     

Impacted Files	Coverage Δ
src/bootstrap.jl	99.30% <100.00%> (+1.41%)	⬆️
src/predict.jl	98.14% <100.00%> (+0.03%)	⬆️

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