menu: do not double escape name in 'menu:clients()' (FS#1202)

Label of menu entries will be escaped automatically.  Doing it manually
in menu:clients() will escape it it twice.

Patch removes the util.escape() call in menu:clients()

Signed-off-by: Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
Signed-off-by: Uli Schlachter <psychon@znc.in>

lib/awful/menu.lua.in

@@ -463,7 +463,7 @@ function menu:clients(args) -- FIXME crude api
     local cls_t = {}
     for k, c in pairs(cls) do
         cls_t[#cls_t + 1] = {
-            util.escape(c.name) or "",
+            c.name or "",
             function ()
                 if not c:isvisible() then
                     tags.viewmore(c:tags(), c.screen)