change wait selector

Author: Nazar65

app/code/Magento/MediaGalleryUi/Test/Mftf/ActionGroup/AdminEnhancedMediaGalleryEnableMassActionModeActionGroup.xml

@@ -13,7 +13,7 @@
             <description>Activate massaction mode by click on Delete Selected..</description>
         </annotations>
 
-        <waitForElementVisible selector="{{AdminEnhancedMediaGalleryMassActionSection.deleteSelected}}" stepKey="waitForMassActionButton"/>
+        <waitForElementVisible selector="{{AdminEnhancedMediaGalleryMassActionSection.deleteImages}}" stepKey="waitForMassActionButton"/>
         <click selector="{{AdminEnhancedMediaGalleryMassActionSection.deleteImages}}" stepKey="clickOnMassActionButton"/>
     </actionGroup>
 </actionGroups>