Make xdg-open work with toad(8) under KDE4.

Index: scripts/xdg-utils-common.in
--- scripts/xdg-utils-common.in.orig
+++ scripts/xdg-utils-common.in
@@ -312,6 +312,7 @@ detectDE()
     if [ x"$DE" = x"" ]; then
       # classic fallbacks
       if [ x"$KDE_FULL_SESSION" != x"" ]; then DE=kde;
+      elif `dbus-send --print-reply --dest=org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus.GetNameOwner string:org.kde.KWin >/dev/null 2>&1` ; then DE=kde;
       elif [ x"$GNOME_DESKTOP_SESSION_ID" != x"" ]; then DE=gnome;
       elif [ x"$MATE_DESKTOP_SESSION_ID" != x"" ]; then DE=mate;
       elif `dbus-send --print-reply --dest=org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus.GetNameOwner string:org.gnome.SessionManager > /dev/null 2>&1` ; then DE=gnome;
