_restore not handling -i DB.TABLE

[srh]

When attempting to use -i DB.TABLE, we get "Error: Archive file had no files" consistently.

Using -i DB works fine.

$ python3 _dump.py -e test.marvel -f marv.tar.gz
            NOTE: 'rethinkdb-dump' saves data, secondary indexes, and write hooks, but does *not* save
            cluster metadata.  You will need to recreate your cluster setup yourself after
            you run 'rethinkdb-restore'.
  Exporting to temporary directory...
    [========================================] 100%
    1 row exported from 1 table, with 0 secondary indexes, and 0 hook functions
  Zipping export directory...
Done (0.23 seconds): /home/srh/sw/rethinkdb-python/marv.tar.gz
$ tar -tf marv.tar.gz 
rethinkdb_dump_2023-11-10T06:46:50/test/marvel.json
rethinkdb_dump_2023-11-10T06:46:50/test/marvel.info
$ python3 _restore.py marv.tar.gz -i test.marvel
Extracting archive file...
Error: Archive file had no files
$ python3 _restore.py marv.tar.gz -i test
Extracting archive file...
  Done (0 seconds)
Importing from directory...
  [========================================] 100%
  1 row imported to 1 table in 0.78 secs

System info I ran this on Ubuntu 22.04 with the tip of the rethinkdb-python repository and v2.4.x.

A user on Slack encountered this problem with some other versions.