Fix single-job archiving (gnt-job archive)
Fix single-job archiving (gnt-job archive)

This is a simply typo from the conversion to multi-job archiving.

Reviewed-by: imsnah

apyrgio/snf-ganeti,yiannist/ganeti,andir/ganeti,yiannist/ganeti,ganeti/ganeti,ganeti-github-testing/ganeti-test-1,mbakke/ganeti,leshchevds/ganeti,apyrgio/snf-ganeti,apyrgio/ganeti,bitemyapp/ganeti,mbakke/ganeti,leshchevds/ganeti,grnet/snf-ganeti,grnet/snf-ganeti,apyrgio/ganeti,mbakke/ganeti,onponomarev/ganeti,bitemyapp/ganeti,ganeti/ganeti,ganeti-github-testing/ganeti-test-1,leshchevds/ganeti,andir/ganeti,ganeti/ganeti,onponomarev/ganeti,andir/ganeti,yiannist/ganeti,dimara/ganeti,dimara/ganeti