luci-app-ssr-plus: fix xray fingerprint

* xray 1.7.3 TLS配置不再支持 fingerprint: disable 参数

luci-app-ssr-plus/luasrc/model/cbi/shadowsocksr/client-config.lua

@@ -715,14 +715,14 @@ o.default = "0"
 if is_finded("xray") then
 	-- [[ uTLS ]]--
 	o = s:option(ListValue, "fingerprint", translate("Finger Print"))
-	o:value("disable", translate("disable"))
+	o:value("", translate("disable"))
 	o:value("firefox", translate("firefox"))
 	o:value("chrome", translate("chrome"))
 	o:value("safari", translate("safari"))
 	o:value("randomized", translate("randomized"))
 	o:depends({type = "v2ray", tls = true})
 	o:depends({type = "v2ray", xtls = true})
-	o.default = "disable"
+	o.default = ""
 end
 
 o = s:option(Value, "tls_host", translate("TLS Host"))