[FIXED] [Death knight][Unholy] Summon Gargoyle attack transition

[FreakzStaff]

[Summon Gargoyle](https://www.wow-freakz.com/spells.php?spell=49206&name=summon-gargoyle) needs to swap targets if target gets killed or becomes invisible or gets provoked/taunted.
Currently it simply stops and does nothing until it expires if the main target dies or goes stealth. And if it gets provoked or taunted it just follows the enemy but not attacking it.

** Retail Example**

**Works:**
13:40 - rogue vanish > gargoyle switches to assist to kill paladin
https://youtube.com/watch?v=lnpxYBGoOC0:



**Works:**
6:04 - killed warlock > switched to shaman
https://youtube.com/watch?v=lnpxYBGoOC0&t=364:



**Works:**
3:43 - Garg used on monk> however warrior taunted it and the gargoyle started attacking warrior instead of the monk. At the moment on freakz gargyle only follows [taunt](https://www.wow-freakz.com/spells.php?spell=355&name=taunt)([provoke](https://www.wow-freakz.com/spells.php?spell=115546)) hero. It should also attack him.
https://youtube.com/watch?v=lnpxYBGoOC0&t=223:





Trello Card Link : https://trello.com/c/TWMmDZyR/1133-death-knightunholy-summon-gargoyle-attack-transition