Fix concurrent modification exception for a part.

Only set the hover ticks on teleporting events. On setting back players
in MovingListener.onTick, this will be prevented now. However actions
might still cause trouble, so some non-blocking stuff would be good here
(a removeFroHover set, some other way of keeping track).

NCPPlugin/src/main/java/fr/neatmonster/nocheatplus/checks/moving/MovingListener.java

@@ -776,7 +776,7 @@ public class MovingListener extends CheckListener implements TickListener, IRemo
 		Combined.resetYawRate(player, ref.getYaw(), System.currentTimeMillis(), true);
 		data.resetTeleported();
 		processingEvents.remove(player.getName());
-		hoverTicks.remove(player.getName());
+		data.sfHoverTicks = -1; // Important against concurrent modification exception.
     }
 
     /**