Fixed footnote extension test to handle new footnote reference link labels.

Author: phillmv

test/extensions.txt

@@ -672,31 +672,31 @@ Hi!
 
 [^unused]: This is unused.
 .
-<p>This is some text!<sup class="footnote-ref"><a href="#fn1" id="fnref1">1</a></sup>. Other text.<sup class="footnote-ref"><a href="#fn2" id="fnref2">2</a></sup>.</p>
-<p>Here's a thing<sup class="footnote-ref"><a href="#fn3" id="fnref3">3</a></sup>.</p>
-<p>And another thing<sup class="footnote-ref"><a href="#fn4" id="fnref4">4</a></sup>.</p>
+<p>This is some text!<sup class="footnote-ref"><a href="#fn:1" id="fnref:1">1</a></sup>. Other text.<sup class="footnote-ref"><a href="#fn:footnote" id="fnref:footnote">2</a></sup>.</p>
+<p>Here's a thing<sup class="footnote-ref"><a href="#fn:other-note" id="fnref:other-note">3</a></sup>.</p>
+<p>And another thing<sup class="footnote-ref"><a href="#fn:codeblock-note" id="fnref:codeblock-note">4</a></sup>.</p>
 <p>This doesn't have a referent[^nope].</p>
 <p>Hi!</p>
 <section class="footnotes">
 <ol>
-<li id="fn1">
-<p>Some <em>bolded</em> footnote definition. <a href="#fnref1" class="footnote-backref">↩</a></p>
+<li id="fn:1">
+<p>Some <em>bolded</em> footnote definition. <a href="#fnref:1" class="footnote-backref">↩</a></p>
 </li>
-<li id="fn2">
+<li id="fn:footnote">
 <blockquote>
 <p>Blockquotes can be in a footnote.</p>
 </blockquote>
 <pre><code>as well as code blocks
 </code></pre>
-<p>or, naturally, simple paragraphs. <a href="#fnref2" class="footnote-backref">↩</a></p>
+<p>or, naturally, simple paragraphs. <a href="#fnref:footnote" class="footnote-backref">↩</a></p>
 </li>
-<li id="fn3">
-<p>no code block here (spaces are stripped away) <a href="#fnref3" class="footnote-backref">↩</a></p>
+<li id="fn:other-note">
+<p>no code block here (spaces are stripped away) <a href="#fnref:other-note" class="footnote-backref">↩</a></p>
 </li>
-<li id="fn4">
+<li id="fn:codeblock-note">
 <pre><code>this is now a code block (8 spaces indentation)
 </code></pre>
-<a href="#fnref4" class="footnote-backref">↩</a>
+<a href="#fnref:codeblock-note" class="footnote-backref">↩</a>
 </li>
 </ol>
 </section>