Add 12/24 hour clock command to protocol info

[julijane]

This adds the command for switching between 12 and 24 hour clock to the protocol documentation.

I could not find the command in any divoom protocol documentation so I traced the HCI packets and got it from there. This was actually tested on a Divoom Pixoo, not a Timebox Evo, but so far it appears that they share the same command package set so I just assume that it is true for the Timebox Evo too.