MC-843: Heading live edit should become unfocused on drag action

- Added index to toolbar selector

Author: Hwashiang Yu

app/code/Magento/PageBuilder/Test/Mftf/Section/PageBuilderHeadingSection.xml

@@ -17,7 +17,7 @@
         <element name="headingOnStage" type="text" selector="(//{{arg1}}[contains(@data-bind,'heading_text')])[{{arg2}}]" parameterized="true"/>
         <element name="headingType" type="button" selector="(//{{arg1}})[{{arg2}}]" parameterized="true"/>
         <element name="headingEditableText" type="button" selector="(//div[contains(@class, 'pagebuilder-heading')])[{{arg1}}]//h2[contains(@contenteditable, 'true')]" parameterized="true"/>
-        <element name="headingToolbar" type="text" selector="(//div[contains(@class,'pagebuilder-heading')])//div[contains(@class, 'pagebuilder-toolbar-options')][{{arg1}}]" parameterized="true"/>
+        <element name="headingToolbar" type="text" selector="(//div[contains(@class,'pagebuilder-heading')])[{{arg1}}]//div[contains(@class, 'pagebuilder-toolbar-options')]" parameterized="true"/>
         <element name="headingTypeToolbar" type="text" selector="(//div[contains(@class,'pagebuilder-heading')])[{{arg1}}]//span[text()='{{arg2}}']" parameterized="true"/>
         <element name="headingTypeToolbarSelected" type="text" selector="(//div[contains(@class,'pagebuilder-heading')])[{{arg1}}]//a[contains(@class, 'toolbar-active')]//span[text()='{{arg2}}']" parameterized="true"/>
         <element name="headingTextAlignToolbar" type="button" selector="(//div[contains(@class,'pagebuilder-heading')])[{{arg1}}]//i[contains(@class,'icon-pagebuilder-align-{{arg2}}')]" parameterized="true"/>