Remove unused 'size' attribute from hint text

We were providing a 'hint' attribute to the hint text on the name
settings page. This isn't supported by the design system or the
`govuk_design_system_formbuilder` gem, so all it does is add an
unsupported HTML attribute.

This commit removes it.

Author: DavidBiddle

app/views/pages/name_settings.html.erb

@@ -17,7 +17,7 @@
             ->(option) { t('helpers.label.page.name_settings_options.names.' + option) },
             ->(option) { t('helpers.label.page.name_settings_options.hints.' + option) },
             legend: { text: t("helpers.label.page.name_settings_options.legends.input_type") },
-            hint: { text: t("helpers.label.page.name_settings_options.hints.input_type"), size: 'm' },
+            hint: { text: t("helpers.label.page.name_settings_options.hints.input_type") },
             bold_labels: false,
             )  %>
       <%= f.govuk_collection_radio_buttons(
@@ -26,7 +26,7 @@
             ->(option) { option },
             ->(option) { t('helpers.label.page.name_settings_options.names.' + option) },
             legend: { text: t("helpers.label.page.name_settings_options.legends.title") },
-            hint: { text: t("helpers.label.page.name_settings_options.hints.title"), size: 'm' },
+            hint: { text: t("helpers.label.page.name_settings_options.hints.title") },
             )  %>
       <%= f.govuk_submit t('continue') %>
     <% end %>
@@ -36,4 +36,3 @@
     </p>
   </div>
 </div>
-