FIX: Don't hide information from the card that is visible in the topic

It doesn't make sense to show less information on the card than already
visible.

app/serializers/hidden_profile_serializer.rb

@@ -1,7 +1,15 @@
 class HiddenProfileSerializer < BasicUserSerializer
-  attributes :profile_hidden?
+  attributes(
+    :profile_hidden?,
+    :title,
+    :primary_group_name
+  )
 
   def profile_hidden?
     true
   end
+
+  def primary_group_name
+    object.primary_group.try(:name)
+  end
 end