Duration after which automatic checkout happens, should not count down (EXPOSUREAPP-6254) (#2796)

Co-authored-by: Mohamed <mohamed.metwalli@sap.com>
Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/ui/eventregistration/attendee/checkins/items/ActiveCheckInVH.kt

@@ -53,8 +53,7 @@ class ActiveCheckInVH(parent: ViewGroup) :
         traceLocationCardHighlightView.setCaption(startDate.toString(DateTimeFormat.mediumDate()))
 
         checkoutInfo.text = run {
-            val checkoutAt = curItem.checkin.checkInEnd
-            val checkoutIn = Duration(Instant.now(), checkoutAt).let {
+            val checkoutIn = Duration(curItem.checkin.checkInStart, curItem.checkin.checkInEnd).let {
                 val periodType = when {
                     it.isLongerThan(Duration.standardHours(1)) -> PeriodType.hours()
                     it.isLongerThan(Duration.standardDays(1)) -> PeriodType.days()