Bug 11312: make facets selectable using an ID -- opac-bootstrap

Bug 11312: make facets selectable using an ID -- opac-bootstrap

To test:
1. search in OPAC directory
2. inspect the facets, note that they now have spans

Signed-off-by: David Cook <dcook@prosentient.com.au>
Works as described.

I'm not sure that this change is necessary, since the parent li elements
have IDs that can be hooked onto for CSS, but it doesn't change existing
behaviour and more control is always nice, so that's all right.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>