Steve Anton 54b8407ee5 Clear current_direction when the RtpTransceiver is stopped
This is specified in the WebRTC specification:
https://w3c.github.io/webrtc-pc/#dom-rtcrtptransceiver-currentdirection

Bug: webrtc:7600
Change-Id: I4c3d434528f8c2aecad9d86dce38f13cf4fee560
Reviewed-on: https://webrtc-review.googlesource.com/55900
Reviewed-by: Seth Hampson <shampson@webrtc.org>
Commit-Queue: Steve Anton <steveanton@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22112}
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