Some adjustments based on code review

Remove unnecessary CSS rule and simplify the logic to make cleanup
easier in the next steps

app/assets/stylesheets/govuk_publishing_components/components/_radio.scss

@@ -1,6 +1,5 @@
 @import "govuk/components/radios/radios";
 
-.gem-c-radio__heading-text,
-.govuk-fieldset__legend h1 {
+.gem-c-radio__heading-text {
   margin: 0 0 govuk-spacing(4) 0;
 }

app/views/govuk_publishing_components/components/_radio.html.erb

@@ -11,6 +11,9 @@
   small ||= false
   inline ||= false
   is_page_heading ||= false
+  heading_lvl = is_page_heading ? 'h1' : shared_helper.get_heading_level
+  heading_classes = %w(govuk-fieldset__heading)
+  heading_classes << "gem-c-radio__heading-text" if heading_lvl == 'h1'
 
   if ['s', 'm', 'l', 'xl'].include?(heading_size)
     size = heading_size
@@ -49,11 +52,9 @@
     <% if heading.present? %>
       <%= tag.legend class: legend_classes do %>
         <%= tag.span(heading_caption, class: "govuk-caption-#{size}") if heading_caption.present? %>
-        <%= tag.h1 heading, class: "gem-c-radio__heading-text govuk-fieldset__heading" if is_page_heading %>
-        <%= content_tag(shared_helper.get_heading_level, heading, class: "govuk-fieldset__heading") unless is_page_heading %>
+        <%= content_tag(heading_lvl, heading, class: heading_classes) %>
       <% end %>
     <% end %>
-
     <% if description.present? %>
       <%= tag.div description, class: "govuk-body" %>
     <% end %>