Revert "MovingSprite: Check if action exists before setting it"

This reverts commit ebc50cd.

The line above specifically states that if the sprite change failed then it will revert to the previous.

Author: swagtoy

src/object/moving_sprite.cpp

@@ -216,10 +216,7 @@ MovingSprite::after_editor_set()
   {
     change_sprite(get_default_sprite_name());
   }
-  if (m_sprite->has_action(current_action))
-  {
-    m_sprite->set_action(current_action);
-  }
+  m_sprite->set_action(current_action);
 
   update_hitbox();
 }