Update liveSearch selector in set email|letter

Changes the selector the live search in the set
email and letter branding pages in service
settings and organisation settings. The current
one targeted the old radios HTML whereas this
version targets the same for the GOVUK Frontend
radios.

app/templates/views/organisations/organisation/settings/set-email-branding.html

@@ -24,7 +24,7 @@
     <div class="govuk-grid-row">
       <div class="govuk-grid-column-full">
         {{ live_search(
-          target_selector='.multiple-choice',
+          target_selector='.govuk-radios__item',
           show=True,
           form=search_form,
           label='Search branding styles by name',

app/templates/views/organisations/organisation/settings/set-letter-branding.html

@@ -24,7 +24,7 @@
     <div class="govuk-grid-row">
       <div class="govuk-grid-column-full">
         {{ live_search(
-          target_selector='.multiple-choice',
+          target_selector='.govuk-radios__item',
           show=True,
           form=search_form,
           label='Search by name',

app/templates/views/service-settings/set-email-branding.html

@@ -24,7 +24,7 @@
     <div class="govuk-grid-row">
       <div class="govuk-grid-column-full">
         {{ live_search(
-          target_selector='.multiple-choice',
+          target_selector='.govuk-radios__item',
           show=True,
           form=search_form,
           label='Search branding styles by name',

app/templates/views/service-settings/set-letter-branding.html

@@ -24,7 +24,7 @@
     <div class="govuk-grid-row">
       <div class="govuk-grid-column-full">
         {{ live_search(
-          target_selector='.multiple-choice',
+          target_selector='.govuk-radios__item',
           show=True,
           form=search_form,
           label='Search by name',