Don't count non-public base versions when calculating percent_done.
Don't count non-public base versions when calculating percent_done.

For https://unisubs.sifterapp.com/projects/12298/issues/550069/comments

eloquence/unisubs,eloquence/unisubs,ReachingOut/unisubs,ReachingOut/unisubs,pculture/unisubs,ReachingOut/unisubs,norayr/unisubs,ofer43211/unisubs,norayr/unisubs,eloquence/unisubs,ujdhesa/unisubs,pculture/unisubs,ofer43211/unisubs,ujdhesa/unisubs,pculture/unisubs,ujdhesa/unisubs,norayr/unisubs,wevoice/wesub,ofer43211/unisubs,norayr/unisubs,ReachingOut/unisubs,wevoice/wesub,eloquence/unisubs,wevoice/wesub,wevoice/wesub,ujdhesa/unisubs,ofer43211/unisubs,pculture/unisubs