Fix for targeting all li's on page

[AwlO]

Fix for issue where all first li's across the page get an active class when running showTabs

[DimaSavchenko]

Hi @AwlO ! Could you explain what problem does your solution fix?

[germancasares]

When you have more li's with the class active on your page, it doesn't take into account which are from tabs and which aren't. This solutions fix that, so only search for active li inside the tabs.

[AwlO]

Late response, but yeah, exactly as @german95n said

[jorisvm]

I just came up with a similar fix.