Improve AI ghosts' target priorities

[zenseii]

Preliminary checks

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

Describe the problem requiring a solution

This issue was reported by several users of fheroes2.

There are still obvious cases when the ghosts do not choose to attack a stack which would grant them immediate higher numbers (aka peasants).

One such reproducible example is if you pit 1 wolf and 4 peasants against 1 ghost. The ghosts will attack the wolves first for whatever reason I can't check right now:

Describe the possible solution

In general, make sure ghosts prioritize more increasing their numbers.

Although there could be cases when purely basing their decision on this isn't the best choice, for example against shooters with peasants in their army.

Additional info

No response