Comment on the CooltrainerFAI bug

Fixes pret#308

Author: Rangi42

engine/battle/trainer_ai.asm

@@ -342,7 +342,10 @@ CooltrainerMAI:
 	jp AIUseXAttack
 
 CooltrainerFAI:
+	; The intended 25% chance to consider switching will not apply.
+	; Uncomment the line below to fix this.
 	cp 25 percent + 1
+	; ret nc
 	ld a, 10
 	call AICheckIfHPBelowFraction
 	jp c, AIUseHyperPotion