signalk: default canbus interface for Cerbo MK2 is wrong

[mpvader]

Applies to: Cerbo MK2, (and maybe other models as well).

interface name is vecan0; but signalk default in venus os can0. As a result, Signalk doesn’t receive any N2K data, and then lots of the value is lost, for example wifi server of van and ais data doesn’t work.

as a workaround, user can go into the config, change can0 into vecan0, and don’t forger to restart signalk server.

What needs to be done is

1. correct this one, perhaps even fix it automatically for people already running into that issue and most likely just giving up on it.
2. check for all models (cerbo old, cerbomk2, cerbo-s, ekrano) and correct where necessary.

Slack: https://victrondevelopment.slack.com/archives/C7C1ZU6UD/p1721065005510819

[mpvader]

• Cerbo GX: can0 and can1
• Cerbo-S GX: can0
• Cerbo GX MK2: vecan0 and vecan1
• Ekrano GX: vecan0 and vecan1
• MultiPlus-II A13: can0