Fix NPC behaviors not appending ent_text

[Blixibon]

This PR appends CAI_BehaviorBase::DrawDebugTextOverlays to NPC debug text. Previously, NPCs would just print the behavior name, which is identical to the behavior seen in CAI_BehaviorBase::DrawDebugTextOverlays. This suggests that calling CAI_BehaviorBase::DrawDebugTextOverlays is the intended design, and doing so allows derived behaviors to append their own, previously unused debug text. For example, CAI_AssaultBehavior prints the NPC's current assault point, CAI_FollowBehavior prints its follow target, etc.

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