Revert "feed.http-hooks" HTTP request construction to use "http_build_query()" so nested "storyData" is handled correctly

Summary:
See <https://discourse.phabricator-community.org/t/storydata-is-blank-in-outgoing-requests-to-the-configured-feed-http-hooks/2366/>.

This behavior was changed by D20049. I think it's generally good that we not accept/encode nested values in a PHP-specific way, but retain `feed.http-hooks` compatibility for now.

Test Plan: {F6190681}

Reviewers: amckinley

Reviewed By: amckinley

Differential Revision: https://secure.phabricator.com/D20114

src/applications/feed/worker/FeedPublisherHTTPWorker.php

@@ -26,6 +26,11 @@ final class FeedPublisherHTTPWorker extends FeedPushWorker {
       'epoch'           => $data->getEpoch(),
     );
 
+    // NOTE: We're explicitly using "http_build_query()" here because the
+    // "storyData" parameter may be a nested object with arbitrary nested
+    // sub-objects.
+    $post_data = http_build_query($post_data, '', '&');
+
     id(new HTTPSFuture($uri, $post_data))
       ->setMethod('POST')
       ->setTimeout(30)