Can you add hicolor fallback for text-x-generic.png ?

Not all themes fallback to Adwaita (for instance, Breeze) but just hicolor. Which gives warnings on start (see [789](https://github.com/vslavik/poedit/issues/789))
Can you include the missing icon under, i.e. /data/icons/hicolor/16x16/mimetypes/ ?
Having this little addition would make the flatpak more accessible.
I made a little one-liner for now, but hacky.
```flatpak run --command=sh net.poedit.Poedit -c "mkdir -p $HOME/.var/app/net.poedit.Poedit/data/icons/hicolor/16x16/mimetypes/ && cp /usr/share/icons/Adwaita/16x16/mimetypes/text-x-generic.png $HOME/.var/app/net.poedit.Poedit/data/icons/hicolor/16x16/mimetypes/"```
Thanks!
Oh, and here it is for convenience [text-x-generic.png](https://gitlab.gnome.org/GNOME/adwaita-icon-theme/-/raw/master/Adwaita/16x16/mimetypes/text-x-generic.png?inline=false)

Start by inspecting /data/icons/hicolor/16x16/mimetypes/ and compare its contents with the requested text-x-generic.png from the linked Adwaita icon. Add the missing icon there, then verify that the Flatpak no longer emits the reported startup warning for themes that fall back only to hicolor.

Written by the indexing model from the issue text.