After a fish installation is upgraded to 3.2.0, active shells could
throw an error attempting to load Git completions. It's just a
transient error but also easily avoidable by using the old style.
See #7822
This is mildly useful when activating virtualenvs. We had remove
these files earlier, but since there are no more false negatives from
__fish_complete_suffix it seems safe to re-add them.