Wrong Global git configuration location when %HOMEDRIVE%\%HOMEPATH% and %USERPROFILE% differs

git.exe uses %USERPROFILE%

TortoiseGit uses %HOMEDRIVE%%HOMEPATH%

What steps will reproduce the problem?

1. start cmd.exe
2. set HOMEDRIVE=D:
3. git config --list --show-origin
4. "%ProgramFiles%\TortoiseGit\bin\TortoiseGitProc.exe" /command:settings
5. edit Global .gitconfig

What version of TortoiseGit and Git are you using? On what operating system?

Git 2.10.0

TGit 2.3.0