fix: drop CORS headers set by Jitsi BOSH server #2
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Purpose
This PR instructs Nginx to drop CORS headers set by the upstream Jitsi BOSH server.
Seems like there was an update to Jitsi where they now send CORS headers, which conflicts with our fix as the server sends multiple sets of CORS headers. I think this hasn't affected production because the one set by upstream takes precedence (which is a valid rule of basically its own domain - as it's currently just iframe wrapped in the app)