add appending of twists' elements to twister.html.detached immediately after creation

to be able to select them via getElem() in situation where they are not selected because not appended yet to body
e.g. it fixes case when fetched short URIs can't be applied on twists which are created in newConversationModal()

js/twister_formatpost.js

@@ -88,7 +88,7 @@ function postToElem(post, kind, promoted) {
     }
 
     // Now create the html elements
-    var elem = $.MAL.getPostTemplate().clone(true);
+    var elem = $.MAL.getPostTemplate().clone(true).appendTo(twister.html.detached);
     elem.removeAttr('id')
         .addClass(kind)
         .attr('data-time', time)