It's already defined in KAboutData

app/main.cpp

@@ -90,8 +90,6 @@ int main(int argc, char **argv)
                          QStringLiteral("https://utils.kde.org/projects/ark")
     );
 
-    aboutData.setOrganizationDomain("kde.org");
-
     aboutData.addAuthor(i18n("Elvis Angelaccio"),
                         i18n("Maintainer"),
                         QStringLiteral("elvis.angelaccio@kde.org"));