snake: clear path on reset

src/snake.ts

@@ -91,6 +91,8 @@ class SnakeCore {
         }
         while (this.body.length > 0)
             this.body.pop();
+        while (g_snakebot.path.length > 0)
+            g_snakebot.path.pop();
         this.startRandom();
         this.foodRegen();
         this.draw();