luci-app-nft-qos: fix lua trace by moving limit_mac_enabled option.

Signed-off-by: Lopot li <gxfclql@gmail.com>

applications/luci-app-nft-qos/luasrc/model/cbi/nft-qos/nft-qos.lua

@@ -99,6 +99,13 @@ o = s:taboption("limit", DynamicList, "limit_whitelist", translate("White List f
 o.datatype = "ipaddr"
 o:depends("limit_enable","1")
 
+--
+-- limit speed by mac address
+--
+o = s:taboption("limitmac", Flag, "limit_mac_enable", translate("Limit Enable"), translate("Enable Limit Rate Feature"))
+o.default = limit_mac_enable or o.enabled
+o.rmempty = false
+
 --
 -- Priority
 --
@@ -224,13 +231,6 @@ if enable_priority == "1" then
 
 end
 
---
--- limit speed by mac address
---
-o = s:taboption("limitmac", Flag, "limit_mac_enable", translate("Limit Enable"), translate("Enable Limit Rate Feature"))
-o.default = limit_mac_enable or o.enabled
-o.rmempty = false
-
 --
 -- Static By Mac Address
 --
@@ -273,4 +273,4 @@ if limit_mac_enable == "1" then
 
 end
 
-return m
+return m