Remove bbob2009_observer from demo.c.
Remove bbob2009_observer from demo.c.

NDManh/numbbo,dtusar/coco,oaelhara/numbbo,dtusar/coco,NDManh/numbbo,dtusar/coco,oaelhara/numbbo,NDManh/numbbo,dtusar/coco,oaelhara/numbbo,NDManh/numbbo,dtusar/coco,NDManh/numbbo,oaelhara/numbbo,oaelhara/numbbo,NDManh/numbbo,NDManh/numbbo,dtusar/coco,dtusar/coco,oaelhara/numbbo,oaelhara/numbbo,oaelhara/numbbo,NDManh/numbbo,dtusar/coco,NDManh/numbbo,dtusar/coco,oaelhara/numbbo