Describe the bug

The MSI installer for Windows 10 x64

1. suggests a wrong install folder (x86 instead of x64)
2. ignores different install folder when changed by user

Tested with installer for 0.6.2:
https://github.com/cli/cli/releases/download/v0.6.2/gh_0.6.2_windows_amd64.msi

Steps to reproduce the behavior

1. Launch .msi install file on Windows 10 x64.
2. See default install location: C:\Program Files (x86)\GitHub CLI (error 1)
3. Change install location to: C:\Program Files\GitHub CLI
4. Finish the install process.
5. See application installed in: C:\Program Files (x86)\GitHub CLI (error 2)

Expected vs actual behavior

1. Default install location to be: C:\Program Files\GitHub CLI
2. User changes to install location to be reflected