Persist the active tab when navigating back to the reports grid

#### Describe the task

The reports grid has two tabs served at ```reports/current-reports``` and ```reports/past-reports```. Currently, all active links that return to the reports grid route to ```current-reports```.

Improved functionality would be to persist the active tab so that the user returns to report grid with the same tab active as when they left.

NOTE: as the tab content is served at their own urls, using the back button DOES work to get back to the last tab you were on.

#### Acceptance Criteria

- [ ] first
- [ ] second
- [ ] third

#### Definition of Done

- [ ] first
- [ ] second
- [ ] third

#### Additional context

- Add any other context about the task here.
- Or here

Start by tracing the active links that return to the reports grid and the routes reports/current-reports and reports/past-reports. Done means returning to the grid preserves the tab that was active before leaving; the issue does not identify files or tests to run.

Written by the indexing model from the issue text.