fix(engine): reset spawn point for following npcs

[tannerdino]

• reset spawn coords of the npc every tick it follows. No way to confirm this in osrs, but if a following npc switches to attack you, it could get stuck if you're far away from its spawn point. Example of this for us would be the dwarf random event
• also only teleports to player after movement is processed, the old code the following npc could tele and move same tick, which didnt match osrs tests