Timesheet does not respect limit:anything

[drehak]

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.)