tests: update test_git.py to use the new single-character flag style
tests: update test_git.py to use the new single-character flag style

The previous commit changed the way transform_kwargs handles
single-character flags with arguments.  This commit updates the
testcase accordingly.

Signed-off-by: David Aguilar <9de348c050f7cd1ca590883733c4e531ce610bf4@gmail.com>

jeblair/GitPython,StyXman/GitPython,zsjohny/GitPython,roidelapluie/GitPython,expobrain/GitPython,beni55/GitPython,cool-RR/GitPython,roidelapluie/GitPython,Conjuro/GitPython,gitpython-developers/gitpython,zsjohny/GitPython,zsjohny/GitPython,pengshp/GitPython,avinassh/GitPython,ghtdak/GitPython,avinassh/GitPython,breavo/GitPython,hvnsweeting/GitPython,StyXman/GitPython,manasdk/GitPython,pengshp/GitPython,dpursehouse/GitPython,cdht/GitPython,h4ck3rm1k3/GitPython,ghtdak/GitPython,gitpython-developers/GitPython,bwrsandman/GitPython,jeblair/GitPython,StyXman/GitPython,nvie/GitPython,avinassh/GitPython,beni55/GitPython,gitpython-developers/GitPython,Conjuro/GitPython,expobrain/GitPython,gitpython-developers/gitpython,breavo/GitPython,pengshp/GitPython,cdht/GitPython,hvnsweeting/GitPython,nvie/GitPython,dpursehouse/GitPython,h4ck3rm1k3/GitPython,cool-RR/GitPython,bwrsandman/GitPython,bwrsandman/GitPython,Conjuro/GitPython,manasdk/GitPython,cool-RR/GitPython,cdht/GitPython,OpenInkpot-archive/iplinux-python-git