luci-mod-network: disable setup on new wifi-iface add

If we add a new wifi-iface to the config then the iface will start at once.
But normaly we would configure the wireless security in the next step.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

modules/luci-mod-network/luasrc/controller/admin/network.lua

@@ -175,7 +175,8 @@ function wifi_add()
 		local net = dev:add_wifinet({
 			mode       = "ap",
 			ssid       = "OpenWrt",
-			encryption = "none"
+			encryption = "none",
+			disabled   = 1
 		})
 
 		ntm:save("wireless")