Add developer_name tag to the appdata file.
Fixes the following lint errors for Flathub:
{
"errors": [
"appstream-missing-developer-name"
]
}
Signed-off-by: Jeremy Whiting <jpwhiting@kde.org>
I'll do the same on release/23.08 and release/24.02 after this is merged. The 23.08 flatpak build failed without this, so it's needed in all 3 branches, right?