SMB3: Backup intent flag missing from compounded ops

When "backup intent" is requested on the mount (e.g. backupuid or
backupgid mount options), the corresponding flag was missing from
some of the new compounding operations as well (now that
open_query_close is gone).

Related to kernel bugzilla #200953

Reported-and-tested-by:  <whh@rubrik.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>