MAGETWO-99509: Download Option not working in Exports

- Remove test

Author: stkorf

app/code/Magento/ImportExport/Test/Mftf/Section/AdminExportMainSection.xml

@@ -9,7 +9,6 @@
           xsi:noNamespaceSchemaLocation="urn:magento:mftf:Page/etc/SectionObject.xsd">
     <section name="AdminExportMainSection">
         <element name="entityType" type="select" selector="#entity"/>
-        <element name="exportFileFormat" type="select" selector="#file_format"/>
         <element name="entityAttributes" type="select" selector="#export_filter_form"/>
     </section>
 </sections>