fix roster user partial rendering

test plan:
  - make a discussion topic
  - as a student make a comment on it
  - go to users/:id_of_student_who_commented
  - under Recent Messages the comment in the
    discussion topic properly renders

Change-Id: Ib8dbf96690846987e6183b75580d7c90c54a1191
Reviewed-on: https://gerrit.instructure.com/43596
Reviewed-by: Cameron Sutter <csutter@instructure.com>
Product-Review: Simon Williams <simon@instructure.com>
QA-Review: Sean Lewis <slewis@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>

Author: Michael Nomitch

app/views/context/roster_user.html.erb

@@ -166,7 +166,7 @@
 <%= t('no_messages', "No Messages") if @messages.empty? %>
 <% @messages[0,10].each do |message| %>
   <% if message.is_a?(DiscussionEntry) %>
-    <%= render :partial => 'discussion_topics/entry', :object => message, :locals => {:out_of_context => true, :show_context => true} %>
+    <%= render :partial => 'discussion_topics/entry', :object => message, :locals => {:out_of_context => true, :show_context => true, :assignment_visible_to_user => message.discussion_topic.visible_for?(@current_user)} %>
   <% end %>
 <% end %>