Fix Xlsx Writer Data Validation (#2369)

Fix issue #2368. PR #2265 moved the place where data validations were written to the worksheet. PR #1694 was installed afterwards, and accidentally restored the original location, so validations are now being written twice.

src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php

@@ -85,9 +85,6 @@ class Worksheet extends WriterPart
         // conditionalFormatting
         $this->writeConditionalFormatting($objWriter, $worksheet);
 
-        // dataValidations
-        $this->writeDataValidations($objWriter, $worksheet);
-
         // hyperlinks
         $this->writeHyperlinks($objWriter, $worksheet);