Support current user install of Git Bash

[njbmartin]

Fixes #39671

[Tyriar]

Looks good, my only concern is that it %LOCALAPPDATA% points to the Local folder:

> process.env['LOCALAPPDATA']
"C:\Users\daimms.REDMOND\AppData\Local"

But in #39671 you say it's installed to Local\Programs? Please verify the default install location 😃

[njbmartin]

@Tyriar Good spot. Can't believe I did such a bad job of copy pasta. 🍝

I simply replaced ProgramFiles with LocalAppData. when I duplicated ${process.env['ProgramFiles']}\\Git\\usr\\bin\\bash.exe 👎

To back up this PR, please find the following references to the correct location:
#10810
kimmobrunfeldt/spawn-default-shell#6

[Tyriar]

Just wanted to check 😄 Thanks for the contribution! 🎆