raise the multicast UDP TTL limit (#6343)

Since 96ba94843b we don't spray packets to all machines on the network.

So we can allow ourself to raise the TTL limit, this allows users who run L3 IGMP Routing infrastructure to pass meshtastic frames over UDP.

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/mesh/udp/UdpMulticastThread.h

@@ -22,7 +22,7 @@ class UdpMulticastThread : public concurrency::OSThread
 
     void start()
     {
-        if (udp.listenMulticast(udpIpAddress, UDP_MULTICAST_DEFAUL_PORT)) {
+        if (udp.listenMulticast(udpIpAddress, UDP_MULTICAST_DEFAUL_PORT, 64)) {
             LOG_DEBUG("UDP Listening on IP: %s", WiFi.localIP().toString().c_str());
             udp.onPacket([this](AsyncUDPPacket packet) { onReceive(packet); });
         } else {