Fixed Addon Backup delete problem

config/rootfiles/core/28/filelists/files

@@ -24,3 +24,4 @@ srv/web/ipfire/cgi-bin/aliases.cgi
 var/ipfire/menu.d/30-network.menu
 srv/web/ipfire/cgi-bin/hardwaregraphs.cgi
 srv/web/ipfire/cgi-bin/credits.cgi
+srv/web/ipfire/cgi-bin/backup.cgi

html/cgi-bin/backup.cgi

@@ -283,7 +283,7 @@ print <<END
 	<td align='right' width='5'>
 		<form method='post' action='$ENV{'SCRIPT_NAME'}'>
 		<input type='hidden' name='ACTION' value='delete' />
-		<input type='hidden' name='FILE' value='addons/backup/$_.ipf' />
+		<input type='hidden' name='FILE' value='addons//backup/$_.ipf' />
 		<input type='image' alt='$Lang::tr{'delete'}' title='$Lang::tr{'delete'}' src='/images/user-trash.png' />
 		</form>
 	</td>