MC-3448: [Test Debt] ReadHtmlWithImage failed on mainline

- fix selector to check for media directive

Author: anthoula

app/code/Magento/PageBuilder/Test/Mftf/Section/PageBuilderHtmlSection.xml

@@ -48,7 +48,7 @@
         <element name="content" type="button" selector="//div[contains(@class, 'pagebuilder-html')][1]//div[contains(text(), '&lt;div class=&quot;my-div&quot;&gt;&lt;/div&gt;')]"/>
     </section>
     <section name="HtmlOnBackendWithImage">
-        <element name="content" type="button" selector="//div[contains(@class, 'pagebuilder-html')][1]/img[not(contains(@src, '{{media'))]"/>
+        <element name="content" type="button" selector="//div[contains(@class, 'pagebuilder-html')][1]/div[contains(@class, 'placeholder-html-code') and contains(text(), '{{media')]"/>
     </section>
     <section name="HtmlOnFrontendWithImage">
         <element name="content" type="button" selector="//div[@data-role='html'][1]/img[not(contains(@src, '{{media'))]"/>