[TD+RA] MISSION_AMBUSH is busted

[ChthonVII]

Due to a capitalization error in TechnoClass::Revealed(), revealed units check whether the house discovering them is AI-controlled when they should instead be checking whether the house that owns them is AI-controlled. Hence MISSION_AMBUSH does nothing.

Here's the fix for RA. The fix for TD is identical.

All credit to screamingchicken for this one.