Make GOVUKDesignSystemFormBuilder the default form builder

app/controllers/application_controller.rb

@@ -1,4 +1,6 @@
 class ApplicationController < ActionController::Base
+  default_form_builder GOVUKDesignSystemFormBuilder::FormBuilder
+
   def render_not_found_html
     render file: Rails.root.join("public/404.html"), status: :not_found
   end

app/views/case_logs/bulk_upload.html.erb

@@ -1,5 +1,5 @@
 <div class="govuk-form-group">
-  <%= form_for @bulk_upload, url: bulk_upload_case_logs_path, method: "post", builder: GOVUKDesignSystemFormBuilder::FormBuilder do |f| %>
+  <%= form_for @bulk_upload, url: bulk_upload_case_logs_path, method: "post" do |f| %>
     <%= f.govuk_error_summary %>
     <%= f.govuk_file_field :case_log_bulk_upload,
         label: { text: "Bulk Upload", size: "l" },

app/views/form/check_answers.html.erb

@@ -8,7 +8,7 @@
           <%= render partial: 'form/check_answers_table', locals: { question: question, case_log: @case_log } %>
         <% end %>
       </dl>
-      <%= form_with model: @case_log, method: "get", builder: GOVUKDesignSystemFormBuilder::FormBuilder do |f| %>
+      <%= form_with model: @case_log, method: "get" do |f| %>
         <%= f.govuk_submit "Save and continue"  %>
       <% end %>
     </div>

app/views/form/page.html.erb

@@ -16,7 +16,7 @@
           <%= page.header %>
         </h1>
       <% end %>
-      <%= form_with model: @case_log, url: form_case_log_path(@case_log), method: "post", builder: GOVUKDesignSystemFormBuilder::FormBuilder do |f| %>
+      <%= form_with model: @case_log, url: form_case_log_path(@case_log), method: "post" do |f| %>
         <%= f.govuk_error_summary %>
         <% page.questions.map do |question| %>
           <div id=<%= question.id + "_div " %><%= display_question_key_div(page, question) %> >