Changing video driver version should also unpin unused flatpak drivers

[Redsandro]

Problem

When the Driver Manager offers a list with multiple versions of the nvidia driver, trying out a couple of them leaves those versions pinned in Flatpak. This causes flatpak to unnecessarily do massive downloads on updates.

Solution

I don't know the different parts responsible for syncing the system driver with the flatpak driver, or flatpak maintenance in general, but at some point, be it in the driver manager, the update manager, or cron health jobs, flatpak should unpin and remove the video drivers that are not currently in use by the host, or at least the last used video driver that is no longer in use by the host system. Either immediately or after some time.

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This is related to linuxmint/mintupdate#792