Reschedule task does not redirect after post

[dekkers]

Describe the bug
Reschedule task does not redirect after post which results in the browser asking to resend the POST request when reload the task list after rescheduling a task

To Reproduce
Steps to reproduce the behavior:

1. Go to task list
2. Open a task and click on "reschedule task"
3. Reload the task list page after the task is rescheduled
4. Browser will ask if you want to resend the POST request that reschedules the task.

Expected behavior
Reloading the task list page should not result in resending the POST request and rescheduling the task again.

OpenKAT version
main