[WiX 5] Migrate uninstall tool

[joeloff]

The uninstall tool is currently built using WiX v3. It should be migrated to v5.

[Frulfump]

It says 5 -> 5 but should be 3 -> 5?

[joeloff]

@NikolaMilosavljevic assigning this to you since you've started on this recently

[joeloff]

It says 5 -> 5 but should be 3 -> 5?

Thanks, I fixed the description

[joeloff]

This was a tracking issue - the work was completed in #428