luci-app-ssr-plus: show dns option mode 3 if is_finded mosdns

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

@@ -92,7 +92,9 @@ o.default = 1
 o = s:option(ListValue, "pdnsd_enable", translate("Resolve Dns Mode"))
 o:value("1", translate("Use DNS2TCP query"))
 o:value("2", translate("Use DNS2SOCKS query and cache"))
+if is_finded("mosdns") then
 o:value("3", translate("Use MOSDNS query (Not Support Oversea Mode)"))
+end
 o:value("0", translate("Use Local DNS Service listen port 5335"))
 o.default = 1