Update Install-WindowsUpdate.ps1

[Geo-Ron]

Change Types Made

• Bug fix (non-breaking change).
• Feature / Enhancement (non-breaking change).
• Breaking change (fix or feature that could cause existing functionality to change).
• Documentation changes.
• PowerShell code changes.

Change Checklist

• Requires a change to the documentation.
• Documentation has been updated.
• Tests to cover my changes, have been added.
• All new and existing tests passed?
• PowerShell code changes: PowerShell v3 compatibility checked?

Related Issue

Fixes #572

[codekaizen]

Made this change locally to Install-WindowsUpdate.ps1 and it doesn't seem to install the updates. It verifies that there are 4 updates but does not install them.

[mwallner]

I'm having a hard time reproducing the issue but would like to include this in the next release anyway. - your thoughts @flcdrg ?