activities_js: remove dead code (out-of-date prototype)

This dead code tripped my grep for 'admin'.  I don't try to update it,
I just remove it so it doesn't turn up in grep.

As well as hardcoding  'admin' (should be SITE_AREA),
this wouldn't work without adding ci_csrf_token
(see Bonfire 0.6 changelog).

bonfire/modules/activities/views/reports/activities_js.php

@@ -41,22 +41,6 @@ function submit_delete(event) {
 		"bLengthChange": false,
 		"aaSorting": [[3,'desc']],
 		"bAutoWidth": false,
-<?php
-/* This is for server side processing
-		"bServerSide": true,
-		'sAjaxSource'    : '<?php echo base_url(); ?>admin/reports/activities/ajax_activity',
-		'fnServerData'   : function(sSource, aoData, fnCallback)
-		{
-			$.ajax({
-			'dataType': 'json',
-			'type'    : 'POST',
-			'url'     : sSource,
-			'data'    : aoData,
-			'success' : fnCallback
-			});
-		},
-*/
-?>
 		"aoColumns": [
 			{ "sWidth": "10%" },
 			null,