Change jitsi test into teacher && teaches(courses)

What does this mr do?

Jitsi rooms were not showing for staff

Actions taken to fix bug

change the test to teacher && teaches(course) instead of teacher && NOT teaches(course)

Does this MR meet the acceptance criteria?

• I have added a changelog entry to reflect the significant changes I made and the bug I fixed.
• A test was created to test the bug.
• I have updated the documentation accordingly.
• I adhere to the style guide.