Fix for: mcu 'CB1': Command format mismatch

Newest version of Klipper seems to have issues running on the latest image. I thought I had to reflash my printer but it was actually the Pad 7 which needed update.

[The following fixed it](https://www.klipper3d.org/RPi_microcontroller.html#building-the-micro-controller-code)

`cd ~/klipper/
make menuconfig

sudo service klipper stop
make flash
sudo service klipper start

`

Start with the linked Klipper RPi microcontroller instructions and the listed make menuconfig, service stop, make flash, and service start commands. Determine whether the issue should document this Pad 7 update procedure or address the reported command-format mismatch; done means the intended change is explicit and the mismatch is verified as resolved or reproducible.

Written by the indexing model from the issue text.