fix: availableFrom now set to correct month for Import Previews

[morremeyer]

Resolves #786.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (68ebbb9) 81.72% compared to head (585293c) 81.72%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #788   +/-   ##
=======================================
  Coverage   81.72%   81.72%           
=======================================
  Files          37       37           
  Lines        3710     3711    +1     
=======================================
+ Hits         3032     3033    +1     
  Misses        578      578           
  Partials      100      100           

Files	Coverage Δ
pkg/importer/parser/ynab-import/parse.go	95.52% <100.00%> (+0.06%)	⬆️

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