need track replay AI that crash land do not count as destroyed for respawn purposes.

[Rhayvn]

This is not much of a problem in modern era missions, most kills are catastrophic.  But for WW2, many shoot downs result in the AI crash landing where the pilot and a heavily damaged aircraft survive and are still present on the map.  The airframe eventually disappears but the group still counts as active.

When using a SPAWN command to generate the group, this results in the group never counting as destroyed to trigger the respawn.