just use the repository c3po is called with and override existing setting

Since django-c3po has a setting GIT_REPOSITORY that's used when calling git_push, I think users expect THAT repository to be used. I'm guessing django-c3po users have no idea what exactly git_push does, shouldn't be bothered with git configuration beyond settings and C3PO should override .git/config since it added it in the first place so "remote show" line should be evicted entirely.