Add setting for do not popup old dates on Thunderbird start

[Mannshoch]

Currently I have several devices that modify my Nextcloud CalDAV.

Every time I open Thunderbird on certain PC first several old dates popup.  Please allow to deactivate this popup. I do not need any information about old Items in my calendar. This Dialog gets anoying especial if you have a low Internet speed and the desktop long time not used.

[Jon]

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