Make the "open" keyboard shortcut work faster

Previously when pressing the `O` key on article list, the handler for
that keypress first simulated a click on that event in order to mark
it as read, and only then opened the website that item links to in
another tab. When having a lot of items on screen this caused a huge
delay between pressing `O` and opening the linked article in a new
tab. The delay was sometimes 5, even 10 whole seconds. This simple fix
makes it so the article opens first, and then the click simulation
happens afterwards.

Signed-off-by: Kuba Orlik <kontakt@kuba-orlik.name>
Signed-off-by: Benjamin Brahmer <info@b-brahmer.de>

js/gui/KeyboardShortcuts.js

@@ -259,10 +259,10 @@
 
     var openLink = function () {
         onActiveItem(function (item) {
-            item.trigger('click');  // mark read
             var url = item.find('.external:visible').attr('href');
             var newWindow = window.open(url, '_blank');
             newWindow.opener = null;
+            setTimeout(()=>item.trigger('click'), 0);  // mark read
         });
     };