FIXED - appended payment code to ID field to make it unique

Author: rakesh-gangani

app/code/Magento/Checkout/view/frontend/web/template/billing-address/form.html

@@ -15,8 +15,8 @@
             <!--/ko-->
             <!-- ko if: (isCustomerLoggedIn && customerHasAddresses) -->
             <div class="choice field">
-                <input type="checkbox" class="checkbox" id="billing-save-in-address-book" data-bind="checked: saveInAddressBook" />
-                <label class="label" for="billing-save-in-address-book">
+                <input type="checkbox" class="checkbox"  data-bind="checked: saveInAddressBook, attr: {id: 'billing-save-in-address-book-' + getCode($parent)}" />
+                <label class="label" data-bind="attr: {for: 'billing-save-in-address-book-' + getCode($parent)}" >
                     <span data-bind="i18n: 'Save in address book'"></span>
                 </label>
             </div>