magento/partners-magento2b2b#459: verify custom customer address attribute shows at checkout

- Added Missing Step key

Author: sagar1dahiwala

app/code/Magento/Customer/Test/Mftf/Test/StorefrontVerifyCustomCustomerAddressAttributeTest.xml

@@ -33,7 +33,7 @@
         </after>
 
         <!--Create new custom customer address attribute-->
-        <actionGroup ref="AdminNavigateToCustomerAddressAttributesPageActionGroup"/>
+        <actionGroup ref="AdminNavigateToCustomerAddressAttributesPageActionGroup" stepKey="adminNavigateToCustomerAddressAttributesPage"/>
         <actionGroup ref="AdminAddOptionsCustomerAttribute" stepKey="adminCreateCustomerFirstAttribute">
             <argument name="defaultLabel" value="{{AttributeDropdownData.label}}"/>
             <argument name="attributeCode" value="{{AttributeDropdownData.code}}"/>