Fix disabling of WiFi

closes #22

modules/admin-full/luasrc/model/cbi/admin_network/wifi.lua

@@ -27,6 +27,7 @@ back.titleref = luci.dispatcher.build_url("admin", "network", "wireless")
 en = s:option(Flag, "disabled", translate("enable"))
 en.enabled = "0"
 en.disabled = "1"
+en.rmempty = false
 
 function en.cfgvalue(self, section)
 	return Flag.cfgvalue(self, section) or "0"

modules/admin-mini/luasrc/model/cbi/mini/wifi.lua

@@ -131,6 +131,7 @@ s = m:section(NamedSection, wifidevs[1], "wifi-device", translate("devices"))
 s.addremove = false
 
 en = s:option(Flag, "disabled", translate("enable"))
+en.rmempty = false
 en.enabled = "0"
 en.disabled = "1"