write-callback-constructor -> write-output-callback-constructor

Author: LeifAndersen

video/private/video-canvas.rkt

@@ -190,7 +190,7 @@
     (define canvas #f)
     (define/public (set-canvas c)
       (set! canvas c))
-    (define/override (write-callback-constructor #:render-status render-status)
+    (define/override (write-output-callback-constructor #:render-status render-status)
       (λ (mode obj)
         (match obj
           [(struct* codec-obj ([codec-context ctx]