Cancel rebroadcast in Tx queue upon receiving another rebroadcast (#2538)

* Make portduino great again

* Upon receiving packet that was seen recently, cancel a rebroadcast if there was one in Tx queue already

---------

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

src/mesh/FloodingRouter.cpp

@@ -21,6 +21,7 @@ bool FloodingRouter::shouldFilterReceived(const meshtastic_MeshPacket *p)
 {
     if (wasSeenRecently(p)) { // Note: this will also add a recent packet record
         printPacket("Ignoring incoming msg, because we've already seen it", p);
+        Router::cancelSending(p->from, p->id); // cancel rebroadcast of this message *if* there was already one
         return true;
     }
 
@@ -62,4 +63,4 @@ void FloodingRouter::sniffReceived(const meshtastic_MeshPacket *p, const meshtas
     }
     // handle the packet as normal
     Router::sniffReceived(p, c);
-}
+}