Remove obsolete Group tag

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

livecd-tools.spec

@@ -20,7 +20,6 @@ Version: 26.1
 Release: 1%{?dist}
 Epoch: 1
 License: GPLv2
-Group: System Environment/Base
 URL: https://github.com/livecd-tools/livecd-tools
 Source0: https://releases.pagure.org/%{name}/%{name}-%{version}.tar.gz
 
@@ -52,7 +51,6 @@ http://fedoraproject.org/wiki/FedoraLiveCD for more details.
 
 %package -n python-imgcreate-sysdeps
 Summary: Common system dependencies for python-imgcreate
-Group: System Environment/Base
 Requires: coreutils
 Requires: xorriso >= 1.4.8
 Requires: isomd5sum
@@ -104,7 +102,6 @@ python-imgcreate.
 %if %{with python2}
 %package -n python2-imgcreate
 Summary: Python 2 modules for building system images
-Group: System Environment/Base
 %{?python_provide:%python_provide python2-imgcreate}
 Requires: python-imgcreate-sysdeps%{?_isa} = %{epoch}:%{version}-%{release}
 Requires: python2-dnf >= 1.1.0
@@ -130,7 +127,6 @@ like live image or appliances.
 %if %{with python3}
 %package -n python3-imgcreate
 Summary: Python 3 modules for building system images
-Group: System Environment/Base
 %{?python_provide:%python_provide python3-imgcreate}
 Requires: python-imgcreate-sysdeps%{?_isa} = %{epoch}:%{version}-%{release}
 Requires: python3-pyparted
@@ -148,7 +144,6 @@ like live image or appliances.
 %ifarch %{ix86} x86_64
 %package -n livecd-iso-to-mediums
 Summary: Tools for installing ISOs to different mediums
-Group: System Environment/Base
 Requires: python-imgcreate-sysdeps%{?_isa} = %{epoch}:%{version}-%{release}
 Conflicts: livecd-tools < 25.0