pq: Remove '.' from default patch filename
When no Gbp: Name
tag is present in a pq commit, gbp uses
git show --pretty=format:%f
to determine the patch description.
It would be nice for gbp to not include .
in default patch names.
I did a quick scan for a convention on patch naming and didn't come up with anything very definitive, although it was not a comprehensive search. Just hoping to start a conversation with this MR.