Fix buttjump hitbox to not include actual player (#2562)

This prevents being able to buttjump to kill enemies while they're being grabbed

src/object/player.cpp

@@ -748,14 +748,15 @@ Player::update(float dt_sec)
   if (m_does_buttjump || (m_stone && m_physic.get_velocity_y() > 30.f && !m_coyote_timer.started()))
   {
     Rectf downbox = get_bbox().grown(-1.f);
-    downbox.set_bottom(get_bbox().get_bottom() + 16.f);
+    downbox.set_top(get_bbox().get_bottom());
+    downbox.set_bottom(downbox.get_bottom() + 16.f);
     for (auto& brick : Sector::get().get_objects_by_type<Brick>()) {
       // stoneform breaks through any kind of bricks
       if (downbox.contains(brick.get_bbox()) && (m_stone || !dynamic_cast<HeavyBrick*>(&brick)))
         brick.try_break(this, is_big());
     }
     for (auto& badguy : Sector::get().get_objects_by_type<BadGuy>()) {
-      if (downbox.contains(badguy.get_bbox()) && badguy.is_snipable())
+      if (downbox.contains(badguy.get_bbox()) && badguy.is_snipable() && !badguy.is_grabbed())
         badguy.kill_fall();
     }
   }