[fenix] For https://github.com/mozilla-mobile/fenix/issues/19054 - Navigate to the Credit card screen when deleting last card. (https://github.com/mozilla-mobile/fenix/pull/19451)

app/src/main/java/org/mozilla/fenix/settings/creditcards/CreditCardsManagementFragment.kt

@@ -61,6 +61,11 @@ class CreditCardsManagementFragment : SecureFragment() {
     @ExperimentalCoroutinesApi
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         consumeFrom(creditCardsStore) { state ->
+            if (!state.isLoading && state.creditCards.isEmpty()) {
+                findNavController().popBackStack()
+                return@consumeFrom
+            }
+
             creditCardsView.update(state)
         }
     }