xfce-extra/xfce4-windowck-plugin: Revbump post dep change

Signed-off-by: Michał Górny <mgorny@gentoo.org>

diff --git a/xfce-extra/xfce4-windowck-plugin/xfce4-windowck-plugin-0.4.6-r1.ebuild b/xfce-extra/xfce4-windowck-plugin/xfce4-windowck-plugin-0.4.6-r2.ebuild
similarity index 100%
rename from xfce-extra/xfce4-windowck-plugin/xfce4-windowck-plugin-0.4.6-r1.ebuild
rename to xfce-extra/xfce4-windowck-plugin/xfce4-windowck-plugin-0.4.6-r2.ebuild