[gimp] desktop: we might not be valid project_group GNOME?

[Jehan <jehanp src gnome org>]

commit caf506af0c406721c2e4ec038e4caf40fe1eddc2
Author: Jehan <jehan girinstud io>
Date:   Tue May 3 22:47:34 2022 +0200

    desktop: we might not be valid project_group GNOME?
    
    appstreamcli returns an info message:
    
    > I: org.gimp.GIMP:3: cid-missing-affiliation-gnome org.gimp.GIMP
    
    Checking the message, it happens because the application ID does not
    start with "org.gnome." (but "org.gimp.").
    
    Double-checking AppStream docs, a note says:
    
    > You should only identify with an umbrella project if you use all their
    > infrastructure and policies, for instance string freezes dates,
    > bugtracker and source control instance.
    
    GNOME Foundation is indeed an umbrella for us for the infrastructure and
    obviously part of its policies. But we are still independant and don't
    depend on GNOME's freeze dates, or release dates, or design rules
    (though we try to follow what makes sense), and so on. So I guess it
    means we should not set this metadata tag? 🤷 Let's drop it.
    
    See: https://freedesktop.org/software/appstream/docs/chap-Metadata.html#tag-project_group

 desktop/org.gimp.GIMP.appdata.xml.in.in | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/desktop/org.gimp.GIMP.appdata.xml.in.in b/desktop/org.gimp.GIMP.appdata.xml.in.in
index c6f9b138b9..f9ecd5b292 100644
--- a/desktop/org.gimp.GIMP.appdata.xml.in.in
+++ b/desktop/org.gimp.GIMP.appdata.xml.in.in
@@ -63,7 +63,6 @@
     <kudo>ModernToolkit</kudo>
     <kudo>UserDocs</kudo>
   </kudos>
-  <project_group>GNOME</project_group>
   <translation type="gettext">gimp20</translation>
 
   <launchable type="desktop-id">gimp.desktop</launchable>