fix(Scripts/Karazhan): Mark optional boss as completed when it dies (#13175)

src/server/scripts/EasternKingdoms/Karazhan/instance_karazhan.cpp

@@ -112,6 +112,11 @@ public:
                         }
                     }
                     break;
+                case NPC_HYAKISS_THE_LURKER:
+                case NPC_SHADIKITH_THE_GLIDER:
+                case NPC_ROKAD_THE_RAVAGER:
+                    SetBossState(DATA_OPTIONAL_BOSS, DONE);
+                    break;
                 default:
                     break;
             }