LP-277 remove dubious destroy loop in Tile::Clear()

- the foreach was generating a compiler warning 'img.QByteArray::d' may be used uninitialized
- explictly destroying the list elements is useless as clearing the list does it implicitly

ground/gcs/src/libs/opmapcontrol/src/internals/tile.cpp

@@ -39,9 +39,6 @@ void Tile::Clear()
     qDebug() << "Tile:Clear Overlays";
 #endif // DEBUG_TILE
     mutex.lock();
-    foreach(QByteArray img, Overlays) {
-        img.~QByteArray();
-    }
     Overlays.clear();
     mutex.unlock();
 }