Remove obsolete Group tag

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

kbibtex.spec

@@ -3,7 +3,6 @@ Version:    0.8.1
 Release:    2%{?dist}
 Summary:    A BibTeX editor for KDE
 
-Group:      Applications/Editors
 License:    GPLv2+
 URL:        https://userbase.kde.org/KBibTeX
 Source0:    https://github.com/KDE/%{name}/archive/v%{version}/%{name}-%{version}.tar.gz
@@ -45,7 +44,6 @@ This package provides the runtime libraries for %{name}
 
 %package  devel
 Summary:  Development files for KBibTeX
-Group:    Development/Libraries
 Requires: %{name}-libs%{?_isa} = %{version}-%{release}
 Requires: kdelibs4-devel%{?_isa} libxslt-devel%{?_isa} poppler-qt-devel%{?_isa}