MAGETWO-71022: After return "RMA" is complete in Admin, "remaining quantity" in customer account shows incorrect value

- Stabilize test

Author: YuliyaLabudova

app/code/Magento/Sales/Test/Mftf/Section/AdminOrderFormAccountSection.xml

@@ -13,5 +13,6 @@
         <element name="email" type="input" selector="#email"/>
         <element name="requiredGroup" type="text" selector=".admin__field.required[data-ui-id='billing-address-fieldset-element-form-field-group-id']"/>
         <element name="requiredEmail" type="text" selector=".admin__field.required[data-ui-id='billing-address-fieldset-element-form-field-email']"/>
+        <element name="defaultGeneral" type="text" selector="//*[text()='Default (General)']" time="15"/>
     </section>
 </sections>