[Bug 1846423]

[Josselin-dulac]

Hello,
I don't have time right now to dig into all the stuff to properly propose a patch, but I assume changing those lines in the file icalparser.c (line 1029-1033 in the current version)  would work

```        case ICAL_TRIGGER_PROPERTY:
            /* Accept DATE-TIME and DURATION */
            if (value_kind != ICAL_DATETIME_VALUE && value_kind != ICAL_DURATION_VALUE)
                value_err = illegal_type;
            break;
```

direct link to the file https://searchfox.org/comm-
central/source/calendar/libical/src/libical/icalparser.c#1029

If an active developer can add this patch, it would be very great (this
bug is pretty much annoying); if not possible I will see how to
participate directly in patching the file, but I'm not used to big
projects participations...

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https://bugs.launchpad.net/bugs/1846423

Title:
  Lightning: Cannot dismiss reminders. Got a VALUE parameter with an
  illegal type for property: VALUE=DURATION

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