MC-3228: Add Missing P0-P1 MFTF Tests For Slider

- Fixing failing slide test for content default values

Author: dhaecker

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

@@ -303,7 +303,7 @@
             <argument name="property" value="PageBuilderSlideItemShowOverlay_Never"/>
         </actionGroup>
         <actionGroup ref="seeInFieldSlideOutProperty" stepKey="seeOverlayColor">
-            <argument name="property" value="PageBuilderSlideItemOverlayColor_HexWhite"/>
+            <argument name="property" value="PageBuilderSlideItemOverlayColor_Empty"/>
         </actionGroup>
         <actionGroup ref="seeInFieldSlideOutProperty" stepKey="seeOverlayTransparency">
             <argument name="property" value="PageBuilderSlideItemOverlayTransparency_0"/>