Correct form class labelled_tabular_form_for uses

Signed-off-by: Alex Coles <alex@alexbcoles.com>

app/helpers/application_helper.rb

@@ -424,7 +424,7 @@ module ApplicationHelper
 
   def labelled_tabular_form_for(record, options = {}, &block)
     options.reverse_merge!(builder: TabularFormBuilder, lang: current_language, html: {})
-    options[:html][:class] = 'tabular' unless options[:html].has_key?(:class)
+    options[:html][:class] = 'form' unless options[:html].has_key?(:class)
     form_for(record, options, &block)
   end