[Bug 1846423]

[Josselin-dulac]

According to the iCal RFC, it should already accept DURATION as it is
the default value type, so it really is a Calendar bug:
https://datatracker.ietf.org/doc/html/rfc5545#section-3.8.6.3

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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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