Fix template function DateTime (#24317)

Before, 500 error


![image](https://user-images.githubusercontent.com/2114189/234170176-403ffd1b-ec27-42be-bff9-86184dc8d74d.png)

templates/admin/org/list.tmpl

@@ -41,7 +41,7 @@
 							<td>{{.NumTeams}}</td>
 							<td>{{.NumMembers}}</td>
 							<td>{{.NumRepos}}</td>
-							<td>{{DateTime "short" .CreatedUnix.FormatLong .CreatedUnix.FormatShort}}</td>
+							<td>{{DateTime "short" .CreatedUnix}}</td>
 							<td><a href="{{.OrganisationLink}}/settings">{{svg "octicon-pencil"}}</a></td>
 						</tr>
 					{{end}}