fix(security): defense-in-depth hardening for plugin_audit

Signed-off-by: Thomas Vincent <thomasvincent@gmail.com>

Author: somethingwithproof

audit.php

@@ -336,7 +336,7 @@ function audit_log() {
 				</tr>
 				</tr>
 			</table>
-			<input type='hidden' id='page' value='<?php print get_request_var('page');?>'>
+			<input type='hidden' id='page' value='<?php print html_escape_request_var('page'); ?>'>
 			</form>
 		</td>
 	</tr>