Change default listen count to one

Avoids multiple local servers showing up on lan - and for 99% of servers one will suffice either way

Author: onebeastchris

core/src/main/java/org/geysermc/geyser/network/netty/GeyserServer.java

@@ -119,7 +119,7 @@ public final class GeyserServer {
 
     public GeyserServer(GeyserImpl geyser, int threadCount) {
         this.geyser = geyser;
-        this.listenCount = Bootstraps.isReusePortAvailable() ?  Integer.getInteger("Geyser.ListenCount", 2) : 1;
+        this.listenCount = Bootstraps.isReusePortAvailable() ?  Integer.getInteger("Geyser.ListenCount", 1) : 1;
         GeyserImpl.getInstance().getLogger().debug("Listen thread count: " + listenCount);
         this.group = TRANSPORT.eventLoopGroupFactory().apply(listenCount, new DefaultThreadFactory("GeyserServer", true));
         this.childGroup = TRANSPORT.eventLoopGroupFactory().apply(threadCount, new DefaultThreadFactory("GeyserServerChild", true));