GCS: Disable setup wizard

Currently the wizard is quite broken.  The way it deals with calibration
is outdated and it can't handle any of our reference platforms.  Disable
it until someone fixes it and at least adds informative messages when it
won't work for other boards.

This addresses https://github.com/PhoenixPilot/PhoenixPilot/issues/109
although hopefully eventually someone will fix it properly.