fix: (Day) Fix so enemies can cast friendly spells on eachother (AscensionGameDev#2124)

Author: AlexVild

Intersect.Server.Core/Entities/Npc.cs

@@ -1340,7 +1340,12 @@ public override bool IsAllyOf(Entity otherEntity)
             switch (otherEntity)
             {
                 case Npc otherNpc:
-                    return Base == otherNpc.Base;
+                    if (!Base.NpcVsNpcEnabled && !otherNpc.Base.NpcVsNpcEnabled)
+                    {
+                        return true;
+                    }
+
+                    return !otherNpc.CanNpcCombat(this);
                 case Player otherPlayer:
                     var conditionLists = Base.PlayerFriendConditions;
                     if ((conditionLists?.Count ?? 0) == 0)