Tweak fixture to enable both responsive and compact

Author: anandamaryon1

packages/nhsuk-frontend/src/nhsuk/components/tables/fixtures.mjs

@@ -990,9 +990,11 @@ const fixtures = {
   },
   'compact': {
     context: {
-      compact: true,
       caption: 'Prescription prepayment certificate (PPC) charges',
       captionSize: 'm',
+      compact: true,
+      responsive: true,
+      firstCellIsHeader: true,
       head: [
         {
           text: 'Item'