variable set twice in client.lua

Very small fix.

From 6933b43bd3d00baba661b367db5450a9179da0c7 Mon Sep 17 00:00:00 2001
From: Jacob Winther <jacob.winther@gmail.com>
Date: Sat, 12 Sep 2009 06:59:58 +1200
Subject: [PATCH 1/2] awful.client: remove duplicate variable

Signed-off-by: Jacob Winther <jacob.winther@gmail.com>
Signed-off-by: Julien Danjou <julien@danjou.info>

lib/awful/client.lua.in

@@ -13,7 +13,6 @@ local ipairs = ipairs
 local table = table
 local math = math
 local setmetatable = setmetatable
-local type = type
 local capi =
 {
     client = client,