Remove obsolete Group tag

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

tslib.spec

@@ -2,7 +2,6 @@ Name:           tslib
 Version:        1.19
 Release:        1%{?dist}
 Summary:        Touchscreen Access Library
-Group:          System Environment/Libraries
 License:        LGPLv2
 URL:            https://github.com/kergoth/tslib
 Source0:        https://github.com/kergoth/tslib/releases/download/%{version}/tslib-%{version}.tar.bz2
@@ -23,7 +22,6 @@ first.
 
 %package        devel
 Summary:        Development files for %{name}
-Group:          Development/Libraries
 Requires:       %{name}%{?_isa} = %{version}-%{release}
 Requires:       pkgconfig