settings/calendar: check for start and end time and allow the end time to be...
settings/calendar: check for start and end time and allow the end time to be set to 24:00, fixes #3868
Closes #3868
Merge request !2721
(cherry picked from commit 833fdebf)
ff9275f7 settings/calendar: check for start and end time and allow the end time to be set to 24:00