direction and track need to be set for hold/unhold

changelog.d/5865.bugfix

@@ -0,0 +1 @@
+Fix for audio only being received in one direction after an un-hold during a sip call.

vector/src/main/java/im/vector/app/features/call/webrtc/WebRtcCall.kt

@@ -683,6 +683,8 @@ class WebRtcCall(
                 direction = RtpTransceiver.RtpTransceiverDirection.SEND_RECV
             }
             for (transceiver in peerConnection?.transceivers ?: emptyList()) {
+                transceiver.sender.track()?.setEnabled(!onHold)
+                transceiver.receiver.track()?.setEnabled(!onHold)
                 transceiver.direction = direction
             }
             updateMuteStatus()