Copter: remove call to visual_odom.update

ArduCopter/Copter.cpp

@@ -111,9 +111,6 @@ const AP_Scheduler::Task Copter::scheduler_tasks[] = {
 #endif
 #if BEACON_ENABLED == ENABLED
     SCHED_TASK_CLASS(AP_Beacon,            &copter.g2.beacon,           update,         400,  50),
-#endif
-#if VISUAL_ODOMETRY_ENABLED == ENABLED
-    SCHED_TASK_CLASS(AP_VisualOdom,       &copter.g2.visual_odom,        update,         400,  50),
 #endif
     SCHED_TASK(update_altitude,       10,    100),
     SCHED_TASK(run_nav_updates,       50,    100),