Restore click handler for changeset entries

The default click handler only handle the, not the rest of the
entry, so retore the handler but add an e.preventDefault() call
to stop the second handler running.

app/assets/javascripts/index/history.js

@@ -8,6 +8,10 @@ OSM.History = function(map) {
     })
     .on("mouseout", "[data-changeset]", function () {
       unHighlightChangeset($(this).data("changeset").id);
+    })
+    .on("click", "[data-changeset]", function (e) {
+      e.preventDefault();
+      clickChangeset($(this).data("changeset").id);
     });
 
   var group = L.featureGroup()