AI: maximize total loss for opponent in case of battle loss

Preliminary checks

• I've checked that there aren't other open issues on the same topic.

Describe the problem requiring a solution

While defencing, computer is trying to kill titans as his aim №1, but it results in 0 killed titans: https://github.com/ihhub/fheroes2/assets/145407420/57c1622c-e657-4a81-95d2-cb42abd2e440

Attacking every other creature would make purple player to have more killed troops, for example, I attack rocs:

https://github.com/ihhub/fheroes2/assets/145407420/e1c696ca-b50d-4661-a472-89b8afe707a0

Describe the possible solution

if we lose the battle, try to do maximum damage as we can

Additional info

version 1.1.0

improve battle do max damage.zip