Reminders: remove _delete_reminder function

Only one call was benefiting from that function also cancelling the
task. Therefore, the function was redundant and has been replaced with
a direct request to delete.

This change has the consequence of also fixing reminder tasks cancelling
themselves. That issue was potentially suppressing errors (such as the
duplicate DELETE request which was fixed earlier). Under normal
circumstances, the scheduler will automatically removed finished tasks
so tasks won't need to cancel/remove themselves.

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