Update adapter.js with the latest version

[mekya]

• https://github.com/ant-media/StreamApp uses adapter in this file
• adapter source code is available here
• WebRTC samples uses the sample adapter

Just get the latest version from source code or from here directly and replace it on StreamApp

Then test if every sample is working as expected

[lastpeony]

The adapter-latest.js file has been updated with the file mentioned, and all samples have been thoroughly tested and confirmed to be functioning as expected.