fix zIndex of a elevated link in a linkoverlay

[wutje]

#5632 was solved by changing the zIndex of the linkbox, however the elevated link it self was not updated. This breaks if the elevated link is before the overlay link in the DOM.

For example:

<LinkBox as='article'>
  <a href='#notworking'>
    Link not working
  </a>
  <Heading>
    <LinkOverlay href='#overlay'>
      Overlay link
    </LinkOverlay>
  </Heading>
  <a href='#working'>
    Link working
  </a>
</LinkBox>

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[hornta]

Does this fix #5918 ?

[m4x3d]

Hey @wutje, thanks for opening that PR and sorry that you had problems with that component after my changes.

As I discussed with @TimKolberger in #5918 we will revert my changes. Will be done with #5964.

[wutje]

My code base worked before this change so I am happy with the revert. Thank you for taking the time to fix this.

[segunadebayo]

I just merged the PR that reverts the changes by @m4x3d.