Give necro pets MASK_PET

DRU-066 Braialla's Judgement targets Pet and requires NECROPETSTATS, so
necro pets must be found by the Pet AoE query; the client leaves Pet
targeting to the server (0x49E440 has no Pet case). Reverts the necro
pet exclusion from 40799f96.

Other MASK_PET readers: MobAI pet aggro scan is still off
(PET_AGGRO_ENABLED = false); InterestManager and validateTarget test
MASK_MOB first, so they don't change. DRU-066 is the only AoE PET power.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/objects/Mob.java

@@ -577,10 +577,8 @@ public class Mob extends AbstractIntelligenceAgent implements Delayed {
         petMinion.despawned = false;
         petMinion.runAfterLoad();
 
-        // Summoned pets carry MASK_PET. Necro pets keep their own NecroPet handling.
-
-        if (!petMinion.isNecroPet())
-            petMinion.setObjectTypeMask(petMinion.getObjectTypeMask() | MBServerStatics.MASK_PET);
+        // Necro pets count as pets too: DRU-066 targets Pet and requires NECROPETSTATS
+        petMinion.setObjectTypeMask(petMinion.getObjectTypeMask() | MBServerStatics.MASK_PET);
 
         DbManager.addToCache(petMinion);
         petMinion.setLoc(petMinion.bindLoc);