MAGETWO-97359: [FT] [MFTF] test fix

Author: zakdma

app/code/Magento/Backend/Test/Mftf/Section/AdminMainActionsSection.xml

@@ -11,5 +11,6 @@
     <section name="AdminMainActionsSection">
         <element name="save" type="button" selector="#save" timeout="30"/>
         <element name="delete" type="button" selector="#delete" timeout="30"/>
+        <element name="add" type="button" selector="#add" timeout="30"/>
     </section>
 </sections>