applets/digital-clock: Fix `Qt.formatDateTime` returns different date when minute changes

`Qt.formatDateTime` uses `MM` instead of `mm` to represent month number.

BUG: 436796
FIXED-IN: 5.24.3


(cherry picked from commit dbdae689ff)

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

@@ -673,7 +673,7 @@ Item {
         if (main.showDate) {
             // If the date has changed, force size recalculation, because the day name
             // or the month name can now be longer/shorter, so we need to adjust applet size
-            var currentDate = Qt.formatDateTime(dataSource.data["Local"]["DateTime"], "yyyy-mm-dd");
+            const currentDate = Qt.formatDateTime(dataSource.data["Local"]["DateTime"], "yyyy-MM-dd");
             if (main.lastDate !== currentDate) {
                 doCorrections = true;
                 main.lastDate = currentDate