Restore the data.annotationFlags parameter for annotations (PR 6672 follow-up)

src/core/annotation.js

@@ -124,6 +124,7 @@ var Annotation = (function AnnotationClosure() {
     data.subtype = dict.get('Subtype').name;
 
     this.setFlags(dict.get('F'));
+    data.annotationFlags = this.flags;
 
     this.setRectangle(dict.get('Rect'));
     data.rect = this.rectangle;