use CFF stream only

fontland/fontland/cff-glyph.rkt

@@ -29,9 +29,7 @@ https://github.com/mbutterick/fontkit/blob/master/src/glyph/CFFGlyph.js
   (define cff (get-table (glyph-font this) 'CFF_))
   (define str (vector-ref (hash-ref* cff 'topDict 'CharStrings) (glyph-id this)))
   (define end (+ (index-item-offset str) (index-item-length str)))
-  (define stream (if (woff-font? (glyph-font this))
-                     (get-table-stream (glyph-font this) 'CFF_)
-                     (ttf-font-port (glyph-font this))))
+  (define stream (get-table-stream (glyph-font this) 'CFF_))
   (pos stream (index-item-offset str))
 
   (define path (Path))