[iOS 13] Dark mode styling issues

[DimitarTodorov]

On iOS 13.x device with dark appearance turned on there are some styling issues with the examples. Attached are screenshots for the issues:

1. CheckBox buttons are not aligned for listview when editing:

   

2. About page font is white on white background:

   

3. Header of listview - white font on white background

   

4. Bottom Safe Area on dataform example is light on dark appearance