AC-246: Update MFFT tests

Rollback targetInput selector and make it work for TinyMCE5

Author: kieuphan2406

app/code/Magento/PageBuilder/Test/Mftf/Section/PageBuilderWYSIWYGSection/WYSIWYGInsertLinkModalSection.xml

@@ -15,6 +15,7 @@
         <element name="browseMediaGalleryButton" type="button" selector="//div[@class='tox-dialog']//label[text()='URL']//..//button[@title='URL']"/>
         <element name="textToDisplayInput" type="input" selector="//div[@class='tox-dialog']//label[text()='Text to display']/..//input"/>
         <element name="titleInput" type="input" selector="//div[@class='tox-dialog']//label[text()='Title']/..//input"/>
+        <element name="targetInput" type="input" selector="button[title='Open link in...']"/>
         <element name="okButton" type="button" selector="//div[@class='tox-dialog']//button[@title='Save']"/>
         <element name="cancelButton" type="button" selector="//div[@aria-label='Insert link']//button//span[.='Cancel']"/>
     </section>