tabs: nested tabs content is not displayed

[gavlinski]

The subtabs content is not automatically loaded when user switch between parent tabs.

The problem can be easily reproduced at:

• https://mcshelby.github.io/hugo-theme-relearn/shortcodes/tabs/index.html
  

Tested with last release.

[McShelby]

Thanks for reporting. This is fixed with the next release - which comes in a minute