Event details are not transfered when switching from simplified editor to sidebar

[tcitworld]

Applicable for title, start & end date,…

[georgehrke]

Okay, so identified multiple problems here:
Edit existing event:

• Event title and other information are transferred just fine.
• non-recurring: Changing the starting time does not work, because that changes the recurrence-id and hence opening the sidebar will fail, because it can't find the event
• recurring: all information is lost, because recurrence-instance does

New event:

• all information is lost, because it generates a new calendar object instance.

Proposed solution: just store calendarObjectInstance in vuex.
@tcitworld Any objections?

[tcitworld]

Proposed solution: just store calendarObjectInstance in vuex.

Yeah, it's the easiest solution.