install: Windows: MSI Upgrade should default to previous install folder, not insist on C:\Go\

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

1.9 release

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

Windows

What did you do?

Had Go 1.9rc2 installed in C:\Program Files\Go
Wizard asked if I wanted to uninstall old during upgrade, I chose YES Wizard asks where I want to install new version, defaults to C:\Go\

What did you expect to see?

I expected it to suggest installation in the previously selected folder, as this is an upgrade, and everything in environment is set for that path.

What did you see instead?

It insists on suggesting C:\Go\ which fills up my root folder with more directories. I don't get it why you don't use Program Files as everything else on Windows. This is not Linux (and you would never suggest to install in /go/ on a Linux system anyway)