Don't debounce the agenda query in the clock widget

`CalendarRepository.findMany` holds every result back by 500 ms, which
was added for the calendar widget to collapse bursts of plugin and
permission changes. `debounce` delays the first result too, so the
agenda part - whose ranking stays 0 until the first result arrives -
only appeared half a second after the clock and the other parts.

The agenda is re-queried on a calendar change or every 15 minutes, so
it does not need the debounce. Make the delay a parameter (still 500 ms
by default) and pass 0 from `CalendarPartProvider`.

app/ui/src/main/java/de/mm20/launcher2/ui/launcher/widgets/clock/parts/CalendarPartProvider.kt

@@ -122,6 +122,10 @@ class CalendarPartProvider : PartProvider, KoinComponent {
                         from = now,
                         to = endOfDay(now),
                         excludeCalendars = excludedCalendars.toList(),
+                        // No debounce: the ranking stays 0 until the first result arrives, and
+                        // the query is only re-run on a calendar change or every 15 minutes, so
+                        // holding the result back would only delay the part's appearance.
+                        debounceMillis = 0,
                     ).first()
                         .filter { !it.isTask }
                         .sortedBy { it.startTime ?: it.endTime }