Fix unused parameter (just rolling branch)

[ijnek]

This fixes the following unused parameter warnings specific to the rolling branch:

/home/ijnek/tmp_workspaces/quasor_ws/src/dynamixel_control/dynamixel_hardware/src/dynamixel_hardware.cpp: In member function ‘virtual hardware_interface::return_type dynamixel_hardware::DynamixelHardware::read(const rclcpp::Time&, const rclcpp::Duration&)’:
/home/ijnek/tmp_workspaces/quasor_ws/src/dynamixel_control/dynamixel_hardware/src/dynamixel_hardware.cpp:242:58: warning: unused parameter ‘time’ [-Wunused-parameter]
  242 | return_type DynamixelHardware::read(const rclcpp::Time & time, const rclcpp::Duration & period)
      |                                     ~~~~~~~~~~~~~~~~~~~~~^~~~
/home/ijnek/tmp_workspaces/quasor_ws/src/dynamixel_control/dynamixel_hardware/src/dynamixel_hardware.cpp:242:89: warning: unused parameter ‘period’ [-Wunused-parameter]
  242 | turn_type DynamixelHardware::read(const rclcpp::Time & time, const rclcpp::Duration & period)
      |                                                              ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~

/home/ijnek/tmp_workspaces/quasor_ws/src/dynamixel_control/dynamixel_hardware/src/dynamixel_hardware.cpp: In member function ‘virtual hardware_interface::return_type dynamixel_hardware::DynamixelHardware::write(const rclcpp::Time&, const rclcpp::Duration&)’:
/home/ijnek/tmp_workspaces/quasor_ws/src/dynamixel_control/dynamixel_hardware/src/dynamixel_hardware.cpp:291:59: warning: unused parameter ‘time’ [-Wunused-parameter]
  291 | return_type DynamixelHardware::write(const rclcpp::Time & time, const rclcpp::Duration & period)
      |                                      ~~~~~~~~~~~~~~~~~~~~~^~~~
/home/ijnek/tmp_workspaces/quasor_ws/src/dynamixel_control/dynamixel_hardware/src/dynamixel_hardware.cpp:291:90: warning: unused parameter ‘period’ [-Wunused-parameter]
  291 | urn_type DynamixelHardware::write(const rclcpp::Time & time, const rclcpp::Duration & period)
      |                                                              ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~

[youtalk]

These are minor modifications. I think we will use them in the future.

[youtalk]

Thank you!