Cancel swap item, fix #364 (#365)

* Cancel swap item, fix #364

* Remove canceling drop item

src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/packets/WorldPackets.java

@@ -217,7 +217,7 @@ public class WorldPackets {
                     @Override
                     public void handle(PacketWrapper wrapper) throws Exception {
                         int status = wrapper.get(Type.UNSIGNED_BYTE, 0);
-                        if (status == 4)
+                        if (status == 6)
                             wrapper.cancel();
                     }
                 });