Scripts: fix warning and cleanup npc_apprentice_mirveda

src/server/game/Entities/Unit/Unit.cpp

@@ -241,8 +241,6 @@ Unit::Unit(bool isWorldObject) :
     for (uint8 i = 0; i < MAX_SPELL_SCHOOL; ++i)
         m_threatModifier[i] = 1.0f;
 
-    m_isSorted = true;
-
     for (uint8 i = 0; i < MAX_MOVE_TYPE; ++i)
         m_speed_rate[i] = 1.0f;