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

[CompactProducer]

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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.

[github-actions]

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