Don't remove from the relay map after a file is requested, as it may be needed by other peers.

It will be cleaned up automatically after 60 seconds, so it is best to keep the data intact until then.

src/main/java/org/qortal/controller/arbitrary/ArbitraryDataFileManager.java

@@ -432,9 +432,6 @@ public class ArbitraryDataFileManager extends Thread {
                     // Forward the message to this peer
                     LOGGER.debug("Asking peer {} for hash {}", peerToAsk, hash58);
                     this.fetchArbitraryDataFile(peerToAsk, peer, signature, hash, message);
-
-                    // Remove from the map regardless of outcome, as the relay attempt is now considered complete
-                    arbitraryRelayMap.remove(hash58);
                 }
                 else {
                     LOGGER.debug("Peer {} not found in relay info", peer);