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Fix walk and fight with formations.

Description

Fix walk and fight with formations.

Introduced in r25102 / rP25102, FindWalkAndFightTargets returns after the first UnitAI finds a target, instead of also querying the rest of the members.

Differential revision: https://code.wildfiregames.com/D4208
Comments by: @Stan, @wraitii
Fixes: #6260