Bug 10125: Babeltheque star image must use sprite

Bug 10125: Babeltheque star image must use sprite

When I removed images from the OPAC in favor of sprites I didn't take
into account the display of star ratings from Babeltheque. This patch
copies the star ratings display from Koha's own ratings display,
though it is not dependent on JavaScript.

I'm sure testing would be easy for someone with access to the
Babeltheque service, but I do not. I temporarily modified the template
to set some variables for testing purposes:

    [% SET SEARCH_RESULT.score_int = 3 %]
    [% SET SEARCH_RESULT.score_avg = 3 %
    [% SET SEARCH_RESULT.num_scores = 87 %]

This enabled the display of the ratings, allowing me to confirm that
stars display correctly. Ratings should work with and without
OpacStarRatings enabled.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
I also fudged the template to test, so QA would need to be done with
someone with Babeltheque access

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>