Remove old record_tag_helper gem

This is a transitional gem to help with upgrading from old versions of
Rails: it provides a deprecated feature that Rails removed.

I audited and I *think* we only used it in one place, and that this one
place doesn't even use any of its functionality for styling or
scripting? So, begone!

Gemfile

@@ -68,9 +68,6 @@ gem "thread-local", "~> 1.1", require: false
 # For debugging.
 gem 'web-console', '~> 4.2', group: :development
 
-# TODO: Review our use of content_tag_for etc and uninstall this!
-gem 'record_tag_helper', '~> 1.0', '>= 1.0.1'
-
 # Reduces boot times through caching; required in config/boot.rb
 gem 'bootsnap', '~> 1.16', require: false
 

app/views/contributions/_contribution.html.haml

@@ -1,5 +1,5 @@
 - contributed = contribution.contributed
-= content_tag_for :li, contribution do
+%li
   %span.point-value= contribution.point_value
   = t 'contributions.contribution.description_html',
       :user_link => link_to(contribution.user.name,