Bugfix: people could progress in the last phase of the tutorial without having the ball if they grabbed it, died and reached the goal (closes #103)

bl_tutorial/src/phases.lua

@@ -367,6 +367,8 @@ function bl_tutorial.kill(player)
 
         child:remove()
         player:get_meta():set_int("bl_has_ball", 0)
+        p_tracker[5].prerequisites_satisfied = false
+        player:set_physics_override({speed = block_league.SPEED})
         minetest.add_entity(ball_pos, "bl_tutorial:ball")
         break
       end