Use upstream screenshots for appdata

There's no reason to override it; the upstream screenshot is perfectly
fine.

glade.spec

@@ -23,7 +23,6 @@ BuildRequires:  libxml2-devel
 BuildRequires:  pygobject3-devel
 BuildRequires:  python3-devel
 BuildRequires:  /usr/bin/xsltproc
-BuildRequires:  libappstream-glib
 
 Requires:       %{name}-libs = %{version}-%{release}
 # The gtk3 version of glade was packaged under the name of 'glade3' for a
@@ -79,15 +78,6 @@ make %{?_smp_mflags}
 %make_install
 find $RPM_BUILD_ROOT -type f -name "*.la" -delete
 
-# Update the screenshot shown in the software center
-#
-# NOTE: It would be *awesome* if this file was pushed upstream.
-#
-# See http://people.freedesktop.org/~hughsient/appdata/#screenshots for more details.
-#
-appstream-util replace-screenshots $RPM_BUILD_ROOT%{_datadir}/appdata/glade.appdata.xml \
-  https://raw.githubusercontent.com/hughsie/fedora-appstream/master/screenshots-extra/glade/a.png 
-
 # Remove rpaths.
 chrpath --delete $RPM_BUILD_ROOT%{_bindir}/glade*
 chrpath --delete $RPM_BUILD_ROOT%{_libdir}/glade/modules/*.so
@@ -151,6 +141,7 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 * Fri Jul 03 2015 Kalev Lember <klember@redhat.com> - 3.19.0-3
 - Switch to Python 3 (#1238957)
 - Use the make_install macro
+- Use upstream screenshots for appdata
 
 * Wed Jun 17 2015 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 3.19.0-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_23_Mass_Rebuild