Timesheet does not respect limit:anything

Extremely similar to #2675, the `timesheet` report/command does not react to `limit:anything`.

```
$ task limit:anything timesheet
0 completed, 0 started.
$ task timesheet limit:anything
0 completed, 0 started.
```

These work though:
- `$ task +school timesheet limit:anything` and its permutations
- `$ task timesheet Submit limit:anything` and its permutations

(Reproduced even with an existing task containing `limit:anything` inside its description - still 0 tasks found.)