Avoid duplicate fast-reviews links

[yakov116]

I think the picture does all the explaining

chalk/chalk#392 really any pr

Press the conversation tab a few times, to get even more review nows :)

[fregante]

This just happened on this very PR with the code on master. Can you also take care of it in this PR?

This is the resulting DOM:

<summary class="text-bold discussion-sidebar-heading discussion-sidebar-toggle hx_rsm-trigger" aria-haspopup="menu" data-hotkey="q" role="button">
      {icon}<span style="font-weight: normal;">– <a href="https://github.com/sindresorhus/refined-github/pull/3209/files#submit-review" class="btn-link muted-link" data-hotkey="v">review now</a></span>
      Reviewers
</summary>

[fregante]

Can you also take care of it in this PR?

Maybe not. The code looks correct. If it happens really often, it might need to be updated to use flex, but this might open up new bugs

summary {display: flex}
.octicon {order: 2; margin-left: auto}
.reviewnow {order: 1; margin-left: 0.3em}