Replace do-while

[travisbrown]

In Dotty do has a new meaning, and it doesn't really save much here. (This is the only instance in Cats.)

[codecov-io]

Codecov Report

Merging #3189 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3189      +/-   ##
==========================================
+ Coverage   92.99%   92.99%   +<.01%     
==========================================
  Files         376      376              
  Lines        7381     7382       +1     
  Branches      195      195              
==========================================
+ Hits         6864     6865       +1     
  Misses        517      517

Flag	Coverage Δ
#scala_version_212	93.32% <100%> (ø)	⬆️
#scala_version_213	90.58% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
...ree/src/main/scala/cats/free/FreeApplicative.scala	98.64% <100%> (+0.01%)	⬆️

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