git : use relative patsh in stead of absolute paths

[mdeweerd]

Issue

I use 'aider' from a cygwin bash prompt.
Aider was installed using a windows installation of python.

As aider submits absolute paths to git, these paths are considered not part of the git repository because D:/path/to/... is considered different from /cygdrive/d/path/to/....
I think this can be solved by using relative paths rather than absolute paths. (git does cope with the '` directory separators).

I've tried setting the path to windows's git but then for some reason, aider does not detect the git repository. It detects the git repository when it uses Cygwin's git.

Version and model info

aider 0.81.3