rc.lua: Use the new API for the client buttons

awesomerc.lua

@@ -426,7 +426,7 @@ for i = 1, 9 do
 end
 
 -- @DOC_CLIENT_BUTTONS@
-clientbuttons = gears.table.join(
+clientbuttons = {
     awful.button({ }, 1, function (c)
         c:emit_signal("request::activate", "mouse_click", {raise = true})
     end),
@@ -437,8 +437,8 @@ clientbuttons = gears.table.join(
     awful.button({ modkey }, 3, function (c)
         c:emit_signal("request::activate", "mouse_click", {raise = true})
         awful.mouse.client.resize(c)
-    end)
-)
+    end),
+}
 
 -- Set keys
 root.keys(globalkeys)