Update Filter.php fix issue £20624

Fix issue magento#20624

Author: irajneeshgupta

app/code/Magento/ImportExport/Block/Adminhtml/Export/Filter.php

@@ -236,8 +236,8 @@ protected function _getSelectHtmlWithValue(Attribute $attribute, $value)
         if ($attribute->getFilterOptions()) {
             $options = [];
 
-            foreach ($attribute->getFilterOptions() as $value => $label) {
-                $options[] = ['value' => $value, 'label' => $label];
+            foreach ($attribute->getFilterOptions() as $filterOptions => $label) {
+                $options[] = ['value' => $filterOptions, 'label' => $label];
             }
         } else {
             $options = $attribute->getSource()->getAllOptions(false);