Drop use of record_tag_helper

We only had one place using it and there's no sign of
upstream doing a rails 6 compatible release.

Gemfile

@@ -55,7 +55,6 @@ gem "oauth-plugin", ">= 0.5.1"
 gem "openstreetmap-deadlock_retry", ">= 1.3.0", :require => "deadlock_retry"
 gem "rack-cors"
 gem "rails-i18n", "~> 4.0.0"
-#gem "record_tag_helper"
 gem "rinku", ">= 2.0.6", :require => "rails_rinku"
 gem "strong_migrations"
 gem "validates_email_format_of", ">= 1.5.1"

app/views/oauth_clients/index.html.erb

@@ -28,9 +28,9 @@
 <% else %>
 <p><%= t ".registered_apps" %></p>
 <% @client_applications.each do |client| %>
-  <%= div_for client do %>
+  <div class="client_application">
     <%= link_to client.name, :action => :show, :id => client.id %>
-  <% end %>
+  </div>
 <% end %>
 <% end %>
 <h3><%= link_to t(".register_new"), :action => :new %></h3>