Reorder nodes in Kunstmaan V3.0

Dispatch PRE_PERSIST & POST_PERSIST events didn't work anymore while reordering. It gives an error 500 with Elastica: /vendor/ruflin/elastica/lib/Elastica/Transport/Http.php at line 154.

Since I don't know who is listening these events, (instead of Elastica), neither why Elastica needs it, I removed them.

At first, these lines were here just to do the same as in editAction method of the same class.