Update gen_config.lua

Fix more than symbols","

luci-app-ssr-plus/root/usr/share/shadowsocksr/gen_config.lua

@@ -315,7 +315,7 @@ local tuic = {
 				udp_relay_mode = server.udp_relay_mode,
 				congestion_control = server.congestion_control,
 				heartbeat = server.heartbeat and server.heartbeat .. "s" or nil,
-				timeout = server.timeout and server.timeout .. "s" or nil,,
+				timeout = server.timeout and server.timeout .. "s" or nil,
 				gc_interval = server.gc_interval and server.gc_interval .. "s" or nil,
 				gc_lifetime = server.gc_lifetime and server.gc_lifetime .. "s" or nil,
 				alpn = server.tls_alpn,