[0877] Added random movement to NPC 1493 near Booty Bay

* Added random movement to creature 1493 (Mok'Rash) near Booty Bay
* Also fixed its respawn time to 2h instead of 30 min
Source: https://www.youtube.com/watch?v=Ne3WQssvEMM
http://www.wowwiki.com/Mok%27rash