videoRtpSession: avoid busy loop

waitForRTCP as nothing to do with the readBlockingMode, so we should
remove this from the condition as it causes a busy loop (if video
is muted, receiver is stopped, condition_variable is always true,
causing a loop on the adaptative bitrate algorithm).

GitLab: #878
Change-Id: If19a43c5350eb43eff694b162d412a80d541f449

src/media/socket_pair.cpp

@@ -222,8 +222,7 @@ SocketPair::waitForRTCP(std::chrono::seconds interval)
 {
     std::unique_lock<std::mutex> lock(rtcpInfo_mutex_);
     return cvRtcpPacketReadyToRead_.wait_for(lock, interval, [this] {
-        return interrupted_ or not listRtcpRRHeader_.empty() or not listRtcpREMBHeader_.empty()
-               or not readBlockingMode_;
+        return interrupted_ or not listRtcpRRHeader_.empty() or not listRtcpREMBHeader_.empty();
     });
 }