[cli] Actually store user-provided prefix path

[CommandMC]

On non-Windows, auth's --import flag prompts the user for a Wine prefix to import the login data from. The provided path is stored inside wine_pfx and... never used again. Because of that, egl_wine_pfx will always be None when reaching the below try block & the os.path.join in read_registry will throw an exception
I assume this was meant to assign to egl_wine_pfx directly

[loathingKernel]

I assume this was meant to assign to egl_wine_pfx directly

According to the reply here I would say you are correct.

[derrod]

Let's merge it before I forget about it again.