Incorrect lfs folder on bare repos that are not named *.git

Instead of checking for a bare repo, the code assumes that the repo is bare if its name ends with `.git`: https://github.com/charmbracelet/git-lfs-transfer/blob/84a308d9feb0175848027d27b939f1a0f9ff72f7/cmd.go#L39-L41

Having a bare repo with a directory name that doesn't end in `.git` causes git-lfs-transfer to place the lfs data in `repo/.git/lfs` instead of `repo/lfs`.

Start in cmd.go at lines 39-41, where the repository's bare status is inferred from its directory name. Reproduce the issue with a bare repository whose name does not end in .git and verify that git-lfs-transfer uses repo/lfs rather than repo/.git/lfs; done means both naming styles select the correct LFS directory.

Written by the indexing model from the issue text.