Player: removed an old hack for setFlying() feedback loop

this is no longer a concern, since we now check if the sent state matches the current state before doing anything, at multiple layers.

src/player/Player.php

@@ -1779,9 +1779,7 @@ class Player extends Human implements CommandSender, ChunkListener, IPlayer{
 		if($ev->isCancelled()){
 			return false;
 		}
-		//don't use setFlying() here, to avoid feedback loops - TODO: get rid of this hack
+		$this->setFlying($fly);
-		$this->flying = $fly;
-		$this->resetFallDistance();
 		return true;
 	}