Exam mode: Individual working time not displayed in sidebar

[florian-glombik]

Describe the bug

The individual working time of a student is not reflected in the sidebar.

To Reproduce

1. Create an exam and give a student an individual working time
2. See that the working time is displayed properly in the exam preview screen
3. See that the working time is not displayed properly in the sidebar

Expected behavior

The working time in the sidebar should reflect the individual working time of the student.

Screenshots

Which version of Artemis are you seeing the problem on?

7.3.1

What browsers are you seeing the problem on?

Chrome

Additional context

Found by @anian03 during exam testing session

Relevant log output

No response