fix(Scripts/BlackMorass): stop rift adds from spawning once Aeonus is up (#26699)

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

src/server/scripts/Kalimdor/CavernsOfTime/TheBlackMorass/instance_the_black_morass.cpp

@@ -32,6 +32,7 @@ const Position PortalLocation[4] =
 ObjectData const creatureData[] =
 {
     { NPC_MEDIVH, DATA_MEDIVH },
+    { NPC_AEONUS, DATA_AEONUS },
     { 0,          0           }
 };