MC-19661: Export Products bug. I can't exclude attributes from CSV file.

Author: Roman Lytvynenko

app/code/Magento/CatalogImportExport/Model/Export/Product.php

@@ -727,7 +727,10 @@ protected function setHeaderColumns($customOptionsData, $stockItemRows)
         $exportAttributes = (
             array_key_exists("skip_attr", $this->_parameters) && count($this->_parameters["skip_attr"])
         ) ?
-            array_intersect($this->_getExportMainAttrCodes(), $this->_getExportAttrCodes()) :
+            array_intersect(
+                $this->_getExportMainAttrCodes(),
+                $this->_customHeadersMapping($this->_getExportAttrCodes())
+            ) :
             $this->_getExportMainAttrCodes();
 
         if (!$this->_headerColumns) {