[1.06 b2] recon mission does not count for field testing

[bvoid]

As subject, flying recon missions does not raise the field test % of recon models.

Test case was vs slavers/mutants without AAA - maybe planes need to actually get shot to raise it.

[Soar_Slitherine]

It uses the same rules as field testing for land units: Units gain field testing when they suffer or inflict hits.