Fix INTERRUPT packet forwarding

[at-wat]

interrupt packets from RS485 port seems not forwarded correctly on https://github.com/T-frog/tf-2md3-firmware/releases/tag/v0.3.0-rc1

Command analyzer started.
Error: The driver of motor_id 0 returned ERROR_LOW_VOLTAGE 
Error: The driver of motor_id 1 returned ERROR_LOW_VOLTAGE 
Error: The driver of motor_id 0 returned ERROR_LOW_VOLTAGE 
Error: The driver of motor_id 1 returned ERROR_LOW_VOLTAGE 
Error: The driver of motor_id 0 returned ERROR_LOW_VOLTAGE 
Error: The driver of motor_id 1 returned ERROR_LOW_VOLTAGE 
Error: The driver of motor_id 0 returned ERROR_LOW_VOLTAGE 

encoder count is updated correctly.

[at-wat]

this looks been caused by the bug in yp-spur fixed by openspur/yp-spur#106

[at-wat]

fixed by openspur/yp-spur#106