removed variable used for testing

Author: bhavyada

robot_controllers/include/robot_controllers/diff_drive_base.h

@@ -173,7 +173,6 @@ class DiffDriveBaseController : public Controller
   float right_last_position_;
   double left_last_timestamp_;
   double right_last_timestamp_;
-  ros::WallTime last_button_press_time_;
 
   ros::Time last_command_;
   ros::Time last_update_;