ide-tape: fix IDE_AFLAG_* atomic accesses

These flags used to be bit numbers and now are single bits in the
->atapi_flags vector. Use them properly.

Spotted-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>