chore: fix date for DatePicker screenshot

Author: rigor789

examples/src/ui/DatePicker/template.xml

@@ -1,9 +1,14 @@
 <Page>
   <GridLayout>
     <ContentView verticalAlignment="center" horizontalAlignment="center">
+      <!-- using a fixed date to simplify screenshot diffs -->
+      <DatePicker day="28" month="8" year="2023" />
+    </ContentView>
+
+    <ContentView visibility="collapse">
       <!-- #region example -->
       <DatePicker />
       <!-- #endregion example -->
     </ContentView>
   </GridLayout>
-</Page>
+</Page>