Site-Manage hardcodes "default" skin in several RSF templates

Several RSF templates in site-manage hardcode references to /library/skin/default/tool.css rather than respecting settings made by app administrators and site owners. Particularly now that in 2.9, "default" is no longer the default skin. The preferred way of generating the CSS headers is to retrieve that HTML from the portal as described in https://source.sakaiproject.org/svn//reference/trunk/docs/architecture/sakai_tool.doc.