[Bug 55070] winemenubuilder adds incorrect prefix

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=55070

--- Comment #9 from [e-mail] ---
Created attachment 74682
  --> https://bugs.winehq.org/attachment.cgi?id=74682
partial revert of the commit f1d4dd7cc83d971c6e69c3f2bdffe85dbcd81c0a which
changes WINEPREFIX to WINECONFIGDIR

This partial revert patch fixes the issue. The root source of the bug is likely
`WINECONFIGDIR` being set incorrectly somewhere else in source or a broken
`wine_get_unix_file_name`.

With this patch applied to Wine-6.19, the output becomes
```
[Desktop Entry]
Name=7-Zip File Manager
Exec=wine C:\\ProgramData\\Microsoft\\Windows\\Start\
Menu\\Programs\\7-Zip\\7-Zip\ File\ Manager.lnk
Type=Application
StartupNotify=true
Icon=EA23_7zFM.0
StartupWMClass=7zfm.exe
```