[dired-avfs] Inside an archive, `diredp-up-directory` and open the archive again leads to a path inside ~/.avfs

[xuhdev]

While the archive can be opened smoothly, diredp-up-directory does not bring the buffer back to "normal" directories. Instead, we are stuck in ~/.avfs.

[xuhdev]

OK, it turns out that this issue is not there when the first time the archive is opened. To reproduce, use the following step:

1. open the dir containing a zip file;
2. open the zip file, everything's normal now;
3. press ^ to go up;
4. open the zip file again.

Now the dired header shows a path in ~/.avfs.