Remove all usage of projection stylesheets

Remove all usage of projection stylesheets

(bug 18497) We don't actually intend for any of these stylesheets to be
used for projection, so providing projection is incorrect.  Opera will
not use screen stylesheets in full-screen mode, but *only* if there's at
least one projection stylesheet present somewhere.  If we remove *all*
projection stylesheets, then theoretically it should fall back to screen
stylesheets.  I've confirmed that this works fine on my dev wiki with
Opera 9.6.