Core/Objects: simplified and corrected hover height addition for flying creatures

src/server/game/Entities/Object/Object.cpp

@@ -1674,10 +1674,7 @@ void WorldObject::UpdateAllowedPositionZ(float x, float y, float &z) const
 
             // Creatures that are simulating flight effects or actual flight should use HoverHeight
             if ((ToUnit() && (ToUnit()->IsFlying() || ToUnit()->IsHovering() || ToUnit()->IsLevitating())) && !ToUnit()->IsUnderWater())
-            {
-                uint32 hoverHeight = GetFloatValue(UNIT_FIELD_HOVERHEIGHT);
-                z += hoverHeight;
-            }
+                z += GetFloatValue(UNIT_FIELD_HOVERHEIGHT);
             break;
         }
         case TYPEID_PLAYER: