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

- use single quote as entity is not necessary

Author: anthoula

app/code/Magento/PageBuilder/Test/Mftf/Data/CmsPageData.xml

@@ -12,7 +12,7 @@
         <data key="content">&lt;div class=&quot;my-div&quot;&gt;&lt;/div&gt;</data>
     </entity>
     <entity name="cmsPageWithImage" type="cms_page">
-        <data key="content">&lt;img src=&quot;{{media url=&#39;wysiwyg/home/home-t-shirts.png&#39;}}&quot;/&gt;</data>
+        <data key="content">&lt;img src=&quot;{{media url='wysiwyg/home/home-t-shirts.png'}}&quot;/&gt;</data>
     </entity>
     <entity name="cmsPageNonexistentDataRole" type="cms_page">
         <data key="content">&lt;div data-role=&quot;row&quot;&gt;&lt;div data-role=&quot;non-existent-content-type&quot;&gt;&lt;/div&gt;&lt;/div&gt;</data>