MC-3610: Remove use of legacy system within slide preview

 - stabilize flaky test

Author: cspruiell

app/code/Magento/PageBuilder/Test/Mftf/Test/AdminPageBuilderTextTest.xml

@@ -366,7 +366,6 @@
         </before>
         <after>
             <actionGroup ref="navigateToMediaGallery" stepKey="navigateToMediaGallery"/>
-            <click selector="{{MediaGallerySection.WysiwygArrow}}" stepKey="openWYSIWYGFolder"/>
             <actionGroup ref="NavigateToMediaFolderActionGroup" stepKey="NavigateToFolder">
                 <argument name="FolderName" value="{{ImageFolder.name}}"/>
             </actionGroup>