Enabling hidden calendars by clicking on the name

[raboof]

Is your feature request related to a problem? Please describe.

Since #3027, you need to click the checkbox next to the event to hide a calendar. This makes sense.

I've seen people not understand this (I guess the colored checkboxes are a bit foreign). This is fine for hiding a calendar, but I think it'd be nice if we did allow re-enabling the calendar by clicking on the name. While arguably-'inconsistent' I think that'd make for a better experience.

Describe the solution you'd like

Moving a calendar from 'active' to 'hidden' should not change (i.e. only be possible by clicking on the checkbox, not by clicking on the name).

Moving a calendar from 'hidden' to 'active' should be possible by clicking on the name as well.

Describe alternatives you've considered

No response

Additional context

No response