Bug#892385: easytag-nautilus: Move appstream metadata here

[Jeremy Bicha]

Package: easytag-nautilus
Severity: important
Version: 2.4.3-2
Tags: patch

easytag includes the AppStream metadata for both easytag and
easytag-nautilus. easytag-nautilus' AppStream metadata needs to be
moved to the easytag-nautilus package for AppStream clients like GNOME
Software to be able to correctly install easytag-nautilus.

I will submit a merge request
https://salsa.debian.org/multimedia-team/easytag/merge_requests

Thanks,
Jeremy Bicha