ENGCOM-1536: Fixed format of purchase date in order grid again. #15176

 - Merge Pull Request #15176 from hostep/magento2:fixed-pr-10260-after-2.1.8
 - Merged commits:
   1. c5bfca6

Author: magento-engcom-team

app/code/Magento/Sales/view/adminhtml/ui_component/sales_order_grid.xml

@@ -187,7 +187,6 @@
                     <item name="dataType" xsi:type="string">date</item>
                     <item name="label" xsi:type="string" translate="true">Purchase Date</item>
                     <item name="sorting" xsi:type="string">desc</item>
-                    <item name="dateFormat" xsi:type="string">MMM dd, YYYY, H:mm:ss A</item>
                 </item>
             </argument>
         </column>