awful.lua - use new tags.clients to enum clients in taglist.label.all

Signed-off-by: Julien Danjou <julien@danjou.info>

lib/awful.lua.in

@@ -1053,13 +1053,12 @@ function widget.taglist.label.all(t, args)
     if sel and sel.tags[t] then
         background = "resize=\"true\" image=\"@AWESOME_ICON_PATH@/taglist/squarefw.png\""
     elseif bg_urgent and fg_urgent then
-        for k, c in pairs(capi.client.get()) do
-            if c.tags[t] then
+        for k, c in pairs(t.clients) do
             background = "resize=\"true\" image=\"@AWESOME_ICON_PATH@/taglist/squarew.png\""
             if c.urgent then
                 bg_color = bg_urgent
                 fg_color = fg_urgent
-                end
+                break
             end
         end
     end