views: remove IP addresses from most pages.

Removed IP addresses from comments and from most other listing pages.
IPs take up a lot of space in many places (especially IPv6 addresses),
and in most of these pages they're rarely useful for catching
sockpuppets.

app/views/artist_versions/_listing.html.erb

@@ -28,9 +28,6 @@
         <%= link_to "»", artist_versions_path(search: { updater_name: artist_version.updater.name }) %>
         <p>
           <%= compact_time(artist_version.updated_at) %>
-          <% if CurrentUser.is_moderator? %>
-            (<%= link_to_ip artist_version.updater_ip_addr %>)
-          <% end %>
         </p>
       <% end %>
       <% if artist_versions_listing_type == :revert %>