fix fox behaviour, fix water dragon aim

* backported b76fac199a

dragons/water_dragon.lua

@@ -89,7 +89,7 @@ mobs:register_mob("mobs_doomed:waterdragon_2", {
 	dogshoot_count_max =5,
 	shoot_interval = 3,
 	arrow = "mobs_doomed:ice",
-	shoot_offset = 0,
+	shoot_offset = -1,
 	pathfinding = false,
 	reach = 5,
 	damage = 2,

mobs/fox.lua

@@ -17,8 +17,8 @@ mobs:register_mob("mobs_doomed:fox", {
 	hp_max = 52,
 	armor = 130,
 	collisionbox = {-0.4, -0.6, -0.4, 0.3, 0.3, 0.3},
-	runaway = true,
-	pathfinding = true,
+--	runaway = true,
+--	pathfinding = true,
 	visual = "mesh",
 	mesh = "fox.b3d",
 	textures = {