make mob constant for velocity rotate with mob.

this simply makes the constant value for continually adding velocity to a mob rotate when the mob rotates. this is because the constant velocity value was not called often enough.

mods/ENTITIES/mcl_mobs/api.lua

@@ -443,8 +443,14 @@ local set_yaw = function(self, yaw, delay, dtime)
 	if math.abs(target_shortest_path) > 280*ddtime then
 		if target_shortest_path > 0 then
 			self.object:set_yaw(self.object:get_yaw()+3.6*ddtime)
+			if self.acc then
+				self.acc=vector.rotate_around_axis(self.acc,vector.new(0,1,0), 3.6*ddtime)
+			end
 		else
 			self.object:set_yaw(self.object:get_yaw()-3.6*ddtime)
+			if self.acc then
+				self.acc=vector.rotate_around_axis(self.acc,vector.new(0,1,0), -3.6*ddtime)
+			end
 		end
 	end