[api-minor] Fix the annotationStorage parameter in PDFPageProxy.render

While the parameter name (clearly) suggests that an `AnnotationStorage`-instance is expected, looking at the only call-sites that include the parameter (i.e. the `PDFPrintServiceFactory` instances) it actually contains just a normal Object.

Hence it seems much more reasonable to actually pass a valid `AnnotationStorage`-instance, as the name suggests, and simply have `PDFPageProxy.render` do the `annotationStorage.getAll()` call. (Since we cannot send an `AnnotationStorage`-instance as-is to the worker-thread, given the "structured clone algorithm".)

src/display/api.js

@@ -1133,7 +1133,8 @@ class PDFPageProxy {
         pageIndex: this._pageIndex,
         intent: renderingIntent,
         renderInteractiveForms: renderInteractiveForms === true,
-        annotationStorage,
+        annotationStorage:
+          (annotationStorage && annotationStorage.getAll()) || null,
       });
     }