Polls hardcodes "default" skin in several locations

In several RSF templates, references to /library/skin/default/tool.css are hardcoded. In a few places, there are references to https://vula.uct.ac.za/library/skin/default/tool.css. These references should respect the currently selected skin instead, preferably by acquiring it from the portal as described in https://source.sakaiproject.org/svn//reference/trunk/docs/architecture/sakai_tool.doc on line 300.