MC-15507: Shipping address is dropped after zip code in new billing address form is filled

- Fix modularity for test.

Author: YuliyaLabudova

app/code/Magento/Checkout/Test/Mftf/Page/CheckoutShippingPage.xml

@@ -12,6 +12,5 @@
         <section name="CheckoutShippingGuestInfoSection"/>
         <section name="CheckoutShippingSection"/>
         <section name="StorefrontCheckoutAddressPopupSection"/>
-        <section name="StorefrontCheckoutAddressSection"/>
     </page>
 </pages>

app/code/Magento/Checkout/Test/Mftf/Section/CheckoutShippingSection.xml

@@ -44,6 +44,5 @@
         <element name="addressFieldValidationError" type="text" selector="div.address div.field .field-error"/>
         <element name="textFieldAttrRequireMessage" type="text" selector="//input[@name='custom_attributes[{{attribute}}]']/ancestor::div[contains(@class, 'control')]/div/span" parameterized="true" timeout="30"/>
         <element name="textFieldAttribute" type="input" selector="[name*='custom_attributes[{{attribute}}]']" parameterized="true" timeout="30"/>
-        <element name="changeAddressButton" type="button" selector=".change-address-popup button.action.action-additional"/>
     </section>
 </sections>