Gyro switching and validation

[Giklab]

Switching a Standard to XL Gyro with equipment in the CT slot(s) does not produce an error, but simply removes the gyro. The design validates even without the gyro present.

[neoancient]

This is a general problem with system equipment, and a similar thing happens when changing the engine or cockpit to something that requires critical slots that already have equipment in them.

[neoancient]

I looked back on this one to reference it and I see that it never got updated with the commit that fixed it.
42eb773