zone_config structure clean

zone/zone_config.cpp

@@ -15,8 +15,7 @@
 	along with this program; if not, write to the Free Software
 	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
-#include "../common/debug.h"
+
 #include "zone_config.h"
 
-ZoneConfig *ZoneConfig::_zone_config = nullptr;
-
+ZoneConfig *ZoneConfig::_zone_config = nullptr;