Passenger entities should not send velocity packets

Signed-off-by: TheMode <themode@outlook.fr>

src/main/java/net/minestom/server/entity/Entity.java

@@ -469,6 +469,8 @@ public class Entity implements Viewable, Tickable, TagHandler, PermissionHandler
             return;
         }
 
+        if (vehicle != null) return;
+
         final boolean noGravity = hasNoGravity();
         final boolean hasVelocity = hasVelocity();
         if (!hasVelocity && noGravity) {