fix footnote hover behavior

Author: jjallaire

src/resources/formats/html/templates/quarto-html.ejs

@@ -295,7 +295,7 @@ window.document.addEventListener("DOMContentLoaded", function (event) {
     const ref = noterefs[i];
     tippyHover(ref, function() {
       // use id or data attribute instead here
-      let href = ref.getAttribute('data-footnote-href');
+      let href = ref.getAttribute('data-footnote-href') || ref.getAttribute('href');
       try { href = new URL(href).hash; } catch {}
       const id = href.replace(/^#\/?/, "");
       const note = window.document.getElementById(id);