Allow picking up items while crawling (#3062)

Allows picking up items (such as springs and stone blocks), while Tux
is crawling (triggered by moving while ducking).

This is to avoid Tux getting trapped by any item that can be grabbed.

Closes #2979.

src/object/player.cpp

@@ -1736,7 +1736,7 @@ Player::position_grabbed_object(bool teleport)
 bool
 Player::try_grab()
 {
-  if (m_controller->hold(Control::ACTION) && !m_grabbed_object && !m_duck && !m_released_object)
+  if (m_controller->hold(Control::ACTION) && !m_grabbed_object && !(m_duck ^ m_crawl) && !m_released_object)
   {
 
     Vector pos(0.0f, 0.0f);