Move startup of session earlier in CSV check

phpcs-errors:0 phpunit-status:successful

upload.php

@@ -5,6 +5,7 @@ require_once __DIR__ . "/functions/functions.php";
 $target = "csv/";
 $target .= basename( $_FILES['uploaded']['name']);
 $targetpart = basename( $_FILES['uploaded']['name']);
+
 //This is our size condition
 if ($uploaded_size > 40000000) {
     echo "Your file is too large.<br>";