feat: Fix inconsistent thumbnails across images

[EyeCantCU]

Addresses an inconsistency where other images can view thumbnails just fine in their respective file managers, but others can't

[fiftydinar]

GTK based DEs work too (tested), so add these too to the list.

Cinnamon doesn't have those in repos, so they need to be built manually.

[castrojo]

What parts need to be built for Cinnamon?

[fiftydinar]

What parts need to be built for Cinnamon?

ffmpegthumbnailer & raw-thumbnailer.

For LxQT:

ffmpegthumbnailer & qt5-imageformats

[castrojo]

We should just be able to add them to Cinnamon here right? The two binaries are in the fedora repos already: https://github.com/ublue-os/cinnamon

[fiftydinar]

We should just be able to add them to Cinnamon here right? The two binaries are in the fedora repos already: https://github.com/ublue-os/cinnamon

Yup.

Weirdly, I did not get those packages out of the box, and when I tried to install them in terminal from live-installation, it reported that those packages are not avaliable.

[EyeCantCU]

All right. I'll get this updated. Thank you for the help with this

[EyeCantCU]

Opening a PR for Cinnamon as well since it isn't built here