fix(Scripts/Hyjal): fix Mark of Kaz'rogal timer (#18753)

fix Mark of Kaz'rogal timer

src/server/scripts/Kalimdor/CavernsOfTime/BattleForMountHyjal/boss_kazrogal.cpp

@@ -87,6 +87,7 @@ public:
 
     Milliseconds GetMarkRepeatTimer()
     {
+        ++_markCounter;
         Milliseconds timer = 45000ms - (5000ms * _markCounter);
         if (timer <= 10000ms)
             return 10000ms;