Using counter0 instead of revcounter0 to check if item is last in ForLoopSimulator

[andreatulimiero]

Hi there,
While using the formset utilities I ran into a strange behavior: when you try to use forloop.last to apply specific settings like shown in the docs, the forloop.last variable is never evaluted to True, if there is more than a form in the formset.

Digging a bit in the code I found out the ForLoopSimulator, and I believe that in ForLoopSimulator::iter(...) , self.last is wrongly updated.
The fix I submitted changes just the variable used to check against self.len_values-1 from self.revcounter0 to self.counter0 (although, there are a ton of different ways to check if the current item is the last item 😅)

[codecov-io]

Codecov Report

Merging #942 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #942   +/-   ##
=======================================
  Coverage   95.23%   95.23%           
=======================================
  Files          24       24           
  Lines        2772     2772           
  Branches      251      251           
=======================================
  Hits         2640     2640           
  Misses         88       88           
  Partials       44       44

Impacted Files	Coverage Δ
crispy_forms/templatetags/crispy_forms_tags.py	97.45% <ø> (ø)	⬆️

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