Fix Job::ExportList()

Fix `Job::ExportList()`

`Job::getList()` returns an array of `Job` objects but current code
appears to expect ADODB database result object.

- Change `Job::exportList()` to expect array of `Job` objects from
  `Job::getList()`
Merge pull request #1254 from mkly/fix_job_export

Fix Job::ExportList()