MAGETWO-90441: Allow inline editing of Heading from stage

- fix tests that check for text-align default

Author: anthoula

dev/tests/acceptance/tests/functional/Magento/FunctionalTest/PageBuilder/Data/AdvancedData.xml

@@ -13,7 +13,7 @@
         <data key="name">Alignment</data>
         <data key="section">advanced</data>
         <data key="fieldName">text_align</data>
-        <data key="value">default</data>
+        <data key="value"/>
         <data key="optionsList">[Default, Left, Center, Right]</data>
     </entity>
     <entity name="PageBuilderAdvancedAlignmentPropertyLeft" type="pagebuilder_advanced_alignment_property">