report_loot now sets proper Mdm::Workspace

* Uses an Mdm::Workspace for loot association when passed one in conf hash

MSP-9523

### Verification
- [x] call db.rb's report_loot with an Mdm::Workspace object in the opts hash's workspace key
- [x] Use IRB to confirm that Mdm::Loot.last.workspace == the Mdm::Workspace you passed in to report_loot