Pendolino Update (to match EU07)

[Lawliet]

Hey SimRail team! 

I've had a great time with the launch, though I don't think I've seen single dragon service. 

Anyway I wanted to suggest an update for the ED250 to fix some issues that were present (and fixed) in the playtest on the EU07.

1. The keyboard control on the brakes needs the same overhaul. 

2. The radio also needs the same suppression or fix for the 'incorrect channel' issue that was fixed in playtesting.

Just a couple things I've noticed so far. 

Thank you!