Fix flying insects not benefiting from their intended effect resistance

[Venera3]

Summary

None

Purpose of change

Extends the downed immunity to flying insect bodytype as intended (instead of insect_flying).

Describe the solution

Changed the bodytype string that doesn't exist for the one that does.

Describe alternatives you've considered

Finally get around to per-mtype effect resistances, or make bodytypes their own struct holding that info. One of these days, but not in the freezes.

Testing

Spawned a giant wasp queen pre-fix, could sweep to down 100% of the time. After the fix it only happened less than half the time.

Additional context

It was only relevant to non-flying flying insects, so the giant wasp queen is the only one affected in vanilla.