ms2 update: force audio queue for IOS to use kAudioSessionCategory_AmbientSound

diff --git a/mediastreamer2 b/mediastreamer2
index 59474c8ff12280a7ae44163d7a851f15c3c1a601..5f49ee2e86ae3f926c6e02b615b4a0521be38391 160000 (submodule)
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit 59474c8ff12280a7ae44163d7a851f15c3c1a601
+Subproject commit 5f49ee2e86ae3f926c6e02b615b4a0521be38391