refactor: remove hardcoded SIP id

[emrahcom]

This commit fixes the issue #496

It removes the hardcoded --id (which is <sip:jibri@127.0.0.1>) from Jibri and puts it into pjsua.config

[jitsi-jenkins]

Hi, thanks for your contribution! If you haven't already done so, could you please make sure you sign our CLA (https://jitsi.org/icla for individuals and https://jitsi.org/ccla for corporations)? We would unfortunately be unable to merge your patch unless we have that piece :(.

[codecov[bot]]

Codecov Report

Merging #502 (3c70be7) into master (f226708) will increase coverage by 0.02%. The diff coverage is n/a.

Additional details and impacted files

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[damencho]

We had already discussed it with @oanaianc