Course setting cannot be saved

[bernhard0309]

Describe the bug
"Save Settings" Button for Course Settings does not work
To Reproduce
Steps to reproduce the behavior:

1. Go to 'Settings"
2. Change Visibility of this course
3. Click "Save Settings"
4. Reload page
5. -> Visibility of this course is not changed

Expected behavior
Save new selected visibility of course

Desktop (please complete the following information):
Windows 10, Edge or Firefox

[alexanderstephan]

Seems to be due to the rename of a function:

[alexanderstephan]

Cannot reproduce locally with latest dev.

[joschahenningsen]

ee92bd6 is currently deployed. Maybe this issue only affects lectures with chat enabled?

[joschahenningsen]

@mono424 was this possibly introduced in #1137?

[mono424]

Could be, I tested again with the new Settings PRs, can we merge? Pretty sure this should fix it already :)

[joschahenningsen]

#1156?