Jo-Philipp Wich 58070b0083 sysupgrade: do not require an extra argument after --restore-backup
Neither --create-backup nor --restore-backup need an image name (following
the backup filename). Treat them in uniform way.

Mostly fixes #12346.

Signed-off-by: Paul Fertser <fercerpav@gmail.com>

SVN-Revision: 34974
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