Scripts: Add override to CheckInRoom() definitions

Fixes -Winconsistent-missing-override

src/server/game/Instances/InstanceScript.cpp

@@ -33,7 +33,7 @@
 BossBoundaryData::~BossBoundaryData()
 {
     for (const_iterator it = begin(); it != end(); ++it)
-        delete it->boundary;
+        delete it->Boundary;
 }
 
 void InstanceScript::SaveToDB()
@@ -106,7 +106,7 @@ void InstanceScript::LoadBossBoundaries(const BossBoundaryData& data)
 {
     for (BossBoundaryEntry const& entry : data)
         if (entry.BossId < bosses.size())
-            bosses[entry.bossId].boundary.insert(entry.Boundary);
+            bosses[entry.BossId].boundary.insert(entry.Boundary);
 }
 
 void InstanceScript::LoadMinionData(const MinionData* data)

src/server/scripts/EasternKingdoms/AlteracValley/boss_drekthar.cpp

@@ -77,7 +77,7 @@ public:
             Talk(SAY_RESPAWN);
         }
 
-        bool CheckInRoom()
+        bool CheckInRoom() override
         {
             if (me->GetDistance2d(me->GetHomePosition().GetPositionX(), me->GetHomePosition().GetPositionY()) > 50)
             {

src/server/scripts/EasternKingdoms/AlteracValley/boss_galvangar.cpp

@@ -78,7 +78,7 @@ public:
                 Talk(SAY_BUFF);
         }
 
-        bool CheckInRoom()
+        bool CheckInRoom() override
         {
             if (me->GetDistance2d(me->GetHomePosition().GetPositionX(), me->GetHomePosition().GetPositionY()) > 50)
             {