Update actionbar share and comment

templates/problem/feed.html

@@ -65,6 +65,7 @@
                 {% set hide_actionbar_comment = True %}
                 {% set pagevote = problem.pagevote %}
                 {% set bookmark = problem.bookmark %}
+                {% set share_url = request.build_absolute_uri(problem.get_absolute_url()) %}
                 {% include "actionbar/list.html" %}
 
                 {% if feed_type=='volunteer' and request.user.has_perm('judge.suggest_problem_changes') %}