Don't generate T DM events for Industry when they're repairing 0 damage
Simplify cscale==0 handling for Industry targets

Previously we would set their dmg to 100 (undamaged) and generate a
 corresponding T DM event.  But there's no point, since they're never
 going to produce again; we may as well just leave them stuck on
 whatever dmg value they're at, and go straight to stripping their flak.