MC-3852: Update Background Image Implementation on Tabs

- Resolve remaining tests

Author: davemacaulay

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

@@ -143,7 +143,7 @@
         <data key="value">magento3.jpg</data>
         <data key="fileName">magento3</data>
         <data key="extension">jpg</data>
-        <data key="path">wysiwyg/magento3</data>
+        <data key="path">wysiwyg</data>
     </entity>
     <entity name="PageBuilderBackgroundImageRoot_JPG" type="pagebuilder_background_image_property">
         <data key="name">Background Image</data>

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

@@ -1968,9 +1968,6 @@
         <actionGroup ref="validateButtonItemsSameSize" stepKey="validateButtonsSameSizeStorefrontMobile1">
             <argument name="buttonGroupPage" value="ButtonGroupOnStorefront"/>
             <argument name="buttonItemPage" value="ButtonItemOnStorefront"/>
-            <argument name="buttonGroupIndex" value="2"/>
-            <argument name="firstButtonIndex" value="3"/>
-            <argument name="secondButtonIndex" value="4"/>
         </actionGroup>
         <executeJS function="return document.querySelectorAll('{{TabOnStorefront.all}}')[0].offsetWidth" stepKey="tabWidthStorefrontMobile"/>
         <executeJS function="return parseInt(window.getComputedStyle({{ButtonItemOnStorefront.jsButtonSelector('1')}}).width)" stepKey="buttonWidthStorefrontMobile"/>