Check warbirds SI switch

[JonnyOThan]

https://forum.kerbalspaceprogram.com/topic/160720-wip131-warbird-cockpits-03pre-mk1-capsule-mk1-inline-cockpit-mk2-inline-cockpit/?do=findComment&comment=4369924

[PubliusKerman]

I opened an issue over on the Warbirds about this frankly because I forgot about this one, but I'm pretty sure it has nothing to do with Reviva. The Warbirds X-1 still is putting me facing down and head forward, with Reviva it just get's rid of the portrait and stops IVA function until end of flight. IVA function comes back after, so it doesn't seem like Reviva is the problem and is just shutting down the IVA due to errors.

theonegalen/WarbirdCockpits#4