modules/admin-full/system: Add option for log_port

modules/admin-full/luasrc/model/cbi/admin_system/system.lua

@@ -96,6 +96,7 @@ end
 
 s:option(Value, "log_size", translate("System log buffer size"), "kiB").optional = true
 s:option(Value, "log_ip", translate("External system log server")).optional = true
+s:option(Value, "log_port", translate("External system log server port")).optional = true
 s:option(Value, "conloglevel", translate("Log output level")).optional = true
 s:option(Value, "cronloglevel", translate("Cron Log Level")).optional = true