Slawek Kaplonski authored Jan 27, 2022 and Claudio Cambra committed Jan 27, 2022

Previously when event was converted from allDay to the "normal" one,
time set by default in the incidence editor was always set to 00:00.
Now it is set to the nearest quarter of the current time.
End time is set to start + 1h to be consistent with the convertion by
drag and drop.

Closes-issue: #119