fix(Update Confirmation Sheet): Add top padding

Before the "Changelog" or homeView.updateChangelogTitle was almost at the edge of the [DraggableScrollableSheet]

We fix it by adding 12px padding off the top, 12px was chosen because [bottom] padding is using 12px so it would make sense for [top] to be using 12px.

lib/ui/widgets/homeView/update_confirmation_sheet.dart

@@ -100,7 +100,7 @@ class UpdateConfirmationSheet extends StatelessWidget {
                     ),
                   ),
                   Padding(
-                    padding: const EdgeInsets.only(left: 24.0, bottom: 12.0),
+                    padding: const EdgeInsets.only(top: 12.0, left: 24.0, bottom: 12.0),
                     child: I18nText(
                       'homeView.updateChangelogTitle',
                       child: Text(