Bug 8827 - YUI CSS files no longer found on Yahoo servers

Bug 8827 - YUI CSS files no longer found on Yahoo servers

This patch removes the [% yuipath %] variable from the link
to the YUI CSS files in the OPAC and adds a hard-coded path
to the local files.

To test, set your yuipath system preference to "from Yahoo's
servers," clear your browser cache, and view the OPAC. The
style and layout should look the same as if your yuipath
preference were set to "local."

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Fixes broken display.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>