Fix wikitext-example-table-row to render output in block mode (#8288)

* Fix wikitext-example-table-row so example output table cell is rendered in block mode

* Use transclude with =block instead of empty line to force block mode parsing

editions/tw5.com/tiddlers/system/wikitext-macros.tid

@@ -75,7 +75,7 @@ type: text/vnd.tiddlywiki
 <tr>
 	<th><<id>></th>
 	<td><$codeblock code=<<code>>/></td>
-	<td><<code>></td>
+	<td><$transclude $variable="code" $mode="block"/></td>
 </tr>
 \end