awful.tag: register 'withcurrent' explicitly

This explicitly registers withcurrent(c) as a manage signal handler so
that it can be removed if necessary.

Signed-off-by: koniu <gkusnierz@gmail.com>
Signed-off-by: Julien Danjou <julien@danjou.info>

lib/awful/tag.lua.in

@@ -374,10 +374,11 @@ capi.client.add_signal("manage", function(c, startup)
             c.screen = capi.mouse.screen
         end
     end
-    withcurrent(c, startup)
     c:add_signal("property::screen", withcurrent)
 end)
 
+capi.client.add_signal("manage", withcurrent)
+
 for s = 1, capi.screen.count() do
     capi.screen[s]:add_signal("tag::history::update", history.update)
 end