switched posts/_expanded to Flag#accessible_to

Author: Oaphi

app/views/posts/_expanded.html.erb

@@ -326,11 +326,7 @@
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-              <% flags_count = if current_user&.at_least_moderator?
-                                 post.flags
-                               else
-                                 post.flags.not_confidential
-                               end.where(handled_by_id: nil).count %>
+              <% flags_count = Flag.accessible_to(current_user, post).where(handled_by_id: nil).count %>
 
               <% own_flags_count = if current_user&.at_least_moderator?
                                      0