[BUG] Airbrakes are always reassigned to brakes action group

[cryptonaut]

KSP Version: 1.0.0 (Build 00830) Linux 64-bit

What Happens: Airbrakes are removed from all custom action groups and reassigned to the brakes AG.

Mods / Add-Ons: None

Steps to Replicate:

1. Create a new craft in the SPH and add an airbrake.
   
2. Remove the airbrake from the brakes action group.
   
3. (Optional) Assign the airbrake to one or more action groups.
   

Result:

When the craft is loaded the airbrakes are removed from custom action groups and reassigned to the brakes action group.