skin/reboot/custom/reboot_service_head.tpl
This should be sufficient...
Code:
{if $homepage}
<link rel="canonical" href="{$current_location}" />
<link rel="prerender prefetch" href="{$current_location}">
{else}
<link rel="canonical" href="https://{$smarty.server.HTTP_HOST}{$smarty.server.REQUEST_URI}" />
<link rel="prerender prefetch" href="https://{$smarty.server.HTTP_HOST}{$smarty.server.REQUEST_URI}" />
{/if}