improve call quality indicator (takes into account video)

[linphone] / mediastreamer2

diff --git a/mediastreamer2 b/mediastreamer2
index d9ce543dee40d7cb7da55e50c6716a25f53ea2ba..abf2a7ec461ac411703233e3554e985d62fa0b9c 160000 (submodule)
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit d9ce543dee40d7cb7da55e50c6716a25f53ea2ba
+Subproject commit abf2a7ec461ac411703233e3554e985d62fa0b9c