Uldaman: fix Annora despawn group id (7000000 -> 700000 triggers world state)

Annora (Artisan Enchanting trainer) does not spawn after clearing the scorpion room in Uldaman on Classic realms.

Classic dungeon creature-group IDs were renumbered, but the instance script still checked for group id `7000000`. As a result, the world-state flag `WORLD_STATE_CUSTOM_SPAWN_ANNORA` was never set.

Update the group id check to `700000`, restoring the correct spawn trigger.

- Clear all scorpions in Annora's room in Uldaman
- Verify Annora spawns and can be interacted with

Root cause analysis and fix suggestion by **miraco** (Discord discussion, 2025-09-01)

Author: mr-jjg

src/game/AI/ScriptDevAI/scripts/eastern_kingdoms/uldaman/instance_uldaman.cpp

@@ -82,7 +82,7 @@ void instance_uldaman::OnCreatureCreate(Creature* pCreature)
 // Prototype, hardcoded
 void instance_uldaman::OnCreatureGroupDespawn(CreatureGroup* pGroup, Creature* /*pCreature*/)
 {
-    if (pGroup->GetGroupId() == 7000000)    
+    if (pGroup->GetGroupId() == 700000)
         instance->GetVariableManager().SetVariable(WORLD_STATE_CUSTOM_SPAWN_ANNORA, 1);
 }