kio_iso: Make the root directory a KIsoDirectory as well
In other places the code assumes that every KArchiveEntry is either a KIsoDirectory or KIsoFile, but that was not true for rootDir().
BUG: 418077
In other places the code assumes that every KArchiveEntry is either a KIsoDirectory or KIsoFile, but that was not true for rootDir().
BUG: 418077