Update selector to match correct messages box

Author: Nazar65

app/code/Magento/Catalog/Test/Mftf/Section/AdminProductMessagesSection.xml

@@ -9,7 +9,7 @@
 <sections xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="urn:magento:mftf:Page/etc/SectionObject.xsd">
     <section name="AdminProductMessagesSection">
-        <element name="successMessage" type="text" selector=".message-success"/>
+        <element name="successMessage" type="text" selector="//div[@id='messages']//div[@class='message message-success success']"/>
         <element name="errorMessage" type="text" selector=".message.message-error.error"/>
     </section>
 </sections>