Taylor Brandstetter 6b381c7456 Call SetVideoCodecSwitchingEnabled on every video media channel.
It was only being called for the first video media channel; with
unified plan SDP mode, it's possible to have multiple video media
channels, one for each video m= section.

Bug: webrtc:10795
Change-Id: I57fda9383d0f8803df1937ac5103d9ae354c0748
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/182404
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Commit-Queue: Taylor <deadbeef@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32010}
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