Make kobo browser use server side by default

[dunxd]

Some updates to the string used to determine whether to use server side rendering or not:

• Include Kobo browsers
• Include point releases of Kindle browser as these have been reported in the wild.
• Display the user agent in config.php since this can be useful for troubleshooting

[EdMartens]

Thanks for the response. indeed $config['cops_server_side_render'] = 'Kindle\/1.0|Kindle\/2.0|Kindle\/3.0|EBRD1101|EBRD1201|cybook|Kobo'; This works.. ;-)