map: Fix buggy handling of remotes that are bare git repositories accessed via ssh

map: Fix buggy handling of remotes that are bare git repositories accessed via ssh

It was treating remote paths of a remote repo as if they were local paths,
and so trying to expand git directories and so forth on them. That led to
bad results, including a path like "foo.git" getting turned into
"foo.git.git"

Sponsored-by: Dartmouth College's OpenNeuro project