Use default RTCConfiguration on iOS

With "aggressive" preset the default bundlePolicy is set to "maxBundle" when it shoud be "balanced" according to spec.

Bug: webrtc:9458
Change-Id: Ifbdd76be3a6d9968574cba857f178d5f859dcb87
Reviewed-on: https://webrtc-review.googlesource.com/88567
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Commit-Queue: Kári Helgason <kthelgason@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24650}
diff --git a/AUTHORS b/AUTHORS
index 41833d0..05b6bbe 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -61,6 +61,7 @@
 Xiaohong Xu <freemine@yeah.net>
 Xiaolei Yu <dreifachstein@gmail.com>
 Yura Yaroshevich <yura.yaroshevich@gmail.com>
+Yuriy Pavlyshak <yuriy@appear.in>
 Hans Knoechel <hans@hans-knoechel.de>
 Korniltsev Anatoly <korniltsev.anatoly@gmail.com>
 Todd Wong <todd.wong.ndq@gmail.com>