Remove obsolete Group tag

References: https://fedoraproject.org/wiki/Changes/Remove_Group_Tag

os-autoinst.spec

@@ -33,7 +33,6 @@ Version:        %{github_version}
 Release:        12%{?github_date:.%{github_date}git%{shortcommit}}%{?dist}
 Summary:        OS-level test automation
 License:        GPLv2+
-Group:          Development/System
 URL:            https://os-autoinst.github.io/openQA/
 Source0:        https://github.com/%{github_owner}/%{github_name}/archive/%{github_commit}/%{github_name}-%{github_commit}.tar.gz