Hey!
This PR should change the behaviour of starting fullDay events that last
several days. The goal was to change the behavior of the "Starting
today, ends T" (T=Tomorrow) event, so it should show how many days it
will occur from the first day on
Before situation:
a fullDay event that started 'today' and ends several days later showed
Today on the first day. The rest of the days it showed X days left.

Y => Yesterday
T => Tomorrow
Target situation with this commit:
a fullDay event that started 'today' shows 'X days left' from the first
day on and 'Today' on the last day.

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Co-authored-by: Veeck <github@veeck.de>