Bug 23078: (follow-up) Update self checkout help page

This patch takes care of some preference instances I missed in the self
checkout module's help page. It also removes some obsolete lines from
Auth.pm.

To test, apply the patch and re-test based on the previous test plan.
Also test in the self-checkout module by logging into self checkout and
clicking the "Help" link in the upper right of the screen.

The settings of the following preferences should be shown correctly:

 - OpacFavicon
 - OPACUserCSS

Signed-off-by: frederik chenier <frederik.chenier@inlibro.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

C4/Auth.pm

@@ -1237,8 +1237,6 @@ sub checkauth {
     my $template_name = ( $type eq 'opac' ) ? 'opac-auth.tt' : 'auth.tt';
     my $template = C4::Templates::gettemplate( $template_name, $type, $query );
     $template->param(
-        OpacAdditionalStylesheet                   => C4::Context->preference("OpacAdditionalStylesheet"),
-        opaclayoutstylesheet                  => C4::Context->preference("opaclayoutstylesheet"),
         login                                 => 1,
         INPUTS                                => \@inputs,
         script_name                           => get_script_name(),

koha-tmpl/opac-tmpl/bootstrap/en/modules/sco/help.tt

@@ -1,15 +1,16 @@
 [% USE raw %]
+[% USE Koha %]
 [% USE Asset %]
 [% USE KohaDates %]
 [% INCLUDE 'doc-head-open.inc' %]
 <title>[% IF ( LibraryNameTitle ) %][% LibraryNameTitle | html %][% ELSE %]Koha [% END %] &rsaquo; Self checkout help</title>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <meta name="generator" content="Koha [% Version | html %]" /> <!-- leave this for stats -->
-<link rel="shortcut icon" href="[% IF ( OpacFavicon  ) %][% OpacFavicon | url %][% ELSE %][% interface | html %]/[% theme | html %]/images/favicon.ico[% END %]" type="image/x-icon" />
+<link rel="shortcut icon" href="[% IF ( Koha.Preference('OpacFavicon')  ) %][% Koha.Preference('OpacFavicon') | url %][% ELSE %][% interface | html %]/[% theme | html %]/images/favicon.ico[% END %]" type="image/x-icon" />
  [% Asset.css("lib/bootstrap/css/bootstrap.min.css") | $raw %]
 [% Asset.css("lib/jquery/jquery-ui.css") | $raw %]
 [% Asset.css("css/sco.css") | $raw %]
-[% IF ( OPACUserCSS ) %]<style>[% OPACUserCSS | $raw %]</style>[% END %]
+[% IF ( Koha.Preference('OPACUserCSS') ) %]<style>[% Koha.Preference('OPACUserCSS') | $raw %]</style>[% END %]
 [% IF ( SCOUserCSS ) %]<style>[% SCOUserCSS | $raw %]</style>[% END %]
 <!--[if lt IE 9]>
     <script src="[% interface | html %]/[% theme | html %]/lib/respond.min.js"></script>