Let Oh My Posh's MSI installation uninstall current version and install new version automatically

[CompactProducer]

Code of Conduct

• I agree to follow this project's Code of Conduct

What would you like to see changed?

When we install Oh My Posh from WinGet or any other source, it does not replace an older version. Instead, it installs a new version instead of uninstalling an older one first. It'd be great if updating Oh My Posh by using its MSI installation uninstalls an older version and installs a newer version for a current user.

[JanDeDobbeleer]

@CompactProducer as of the next one this will happen, I had a bug in the installer which causes this not to work on current installs. Now, it seems to be a registry issue more than a duplication issue on file level.