Reporting rates simple fix

After extensive back and forth with Rowena/Chester, this is the temporary-ish fix to make the report useful to WFP (or anyone, for that matter).

This way instead of doing unclear things with the dates and what "late" means, for now this just shows who has reported during a time period.

The restriction to only `stock` ledgers was also dropped in this, because it would make filtering by form useless as there are forms that don't submit these ledger types.