Revert "Don't close the sidebar on click"

This reverts commit 04504dca0b36cffd57d3fd7fe071fd1ef52079b0.

h/static/scripts/annotator/guest.coffee

@@ -183,6 +183,9 @@ module.exports = class Guest extends Annotator
 
   _setupWrapper: ->
     @wrapper = @element
+    .on 'click', (event) =>
+      if !@selectedTargets?.length
+        @triggerHideFrame()
     this
 
   # These methods aren't used in the iframe-hosted configuration of Annotator.