Switch to side-by-side view

--- a/src/desktop/recoll.appdata.xml
+++ b/src/desktop/recoll.appdata.xml
@@ -17,7 +17,7 @@
  </ul>
  </description>
  <screenshots>
-  <screenshot type="default">http://www.recoll.org/files/recoll-1.19.13-mainwin-1248x702.png</screenshot>
+  <screenshot type="default">http://www.recoll.org/files/recoll-mainwin-h-1248x702.png</screenshot>
  </screenshots>
  <url type="homepage">http://www.recoll.org/</url>
  <updatecontact>contact@recoll.org</updatecontact>