Don't show rollback button if the next_version is waiting_moderation.
Don't show rollback button if the next_version is waiting_moderation.

For: https://unisubs.sifterapp.com/projects/12298/issues/606733/comments

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