[0.x] Update webrtc adapter to 8.2.2 (#3204)

[tmatth]

• html: update to webrtc-adapter 8.2.2
• bower.json: update to webrtc adapter 8.2.2
• package.json: update to webrtc-adapter 8.2.2

(cherry picked from commit fb831d8be9bd81bacc8012528abdafe945574bc3)

[lminiero]

Thanks, merging!