[applets/digital-clock] Fix event list item height

Because the content is manufactured from scratch, we need to set the
height manually, or else everything will get scrunched together.

BUG: 427281
FIXED-IN: 5.20

applets/digital-clock/package/contents/ui/CalendarView.qml

@@ -263,6 +263,7 @@ PlasmaComponents3.Page {
 
                         delegate: PlasmaExtras.ListItem {
                             id: eventItem
+                            implicitHeight: eventGrid.height + PlasmaCore.Units.smallSpacing * 2
                             property bool hasTime: {
                                 // Explicitly all-day event
                                 if (modelData.isAllDay) {