fix: remove 'Bridgy Fed' title

The test is checking for notes, but 'Bridge Fed' is, in fact, an article according to the post discovery algorithm. Also, I'm adding as note that the main difference between a note and an article is that the latter has a title, while the first doesn't.

tests/data/feed.example.com/rss

@@ -90,7 +90,7 @@ Connection: keep-alive
     <slash:comments>0</slash:comments>
     </item>
     <item>
-    <title>Bridgy Fed</title>
+    <title></title>
     <link>https://snarfed.org/2017-10-22_bridgy-fed</link>
     <comments>https://snarfed.org/2017-10-22_bridgy-fed#respond</comments>
     <pubDate>Mon, 23 Oct 2017 04:01:46 +0000</pubDate>
@@ -194,4 +194,4 @@ Connection: keep-alive
     <slash:comments>84</slash:comments>
     </item>
   </channel>
-</rss>
+</rss>