Remove obsolete Group tag

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

libgnomecanvas.spec

@@ -7,7 +7,6 @@ Release: 16%{?dist}
 URL: http://www.gnome.org/
 Source0: http://download.gnome.org/sources/libgnomecanvas/2.30/%{name}-%{version}.tar.bz2
 License: LGPLv2+
-Group: System Environment/Libraries
 BuildRequires: gtk2-devel
 BuildRequires: libart_lgpl-devel
 BuildRequires: libglade2-devel 
@@ -22,7 +21,6 @@ Tk canvas widget but has evolved quite a bit over time.
 
 %package devel
 Summary: Libraries and headers for libgnomecanvas
-Group: Development/Libraries
 Requires: %{name} = %{version}-%{release}
 # for /usr/share/gtk-doc/html
 Requires: gtk-doc