Core: Fixed warning C4263: 'bool Creature::SetDisableGravity(bool,bool)' : member function does not override any base class virtual member function

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

@@ -17565,7 +17565,7 @@ bool Unit::SetWalk(bool enable)
     return true;
 }
 
-bool Unit::SetDisableGravity(bool disable)
+bool Unit::SetDisableGravity(bool disable, bool packetOnly /*= false*/)
 {
     if (disable == IsLevitating())
         return false;