fix(aot): Remove AuthBackend param for AOT support

[davideast]

Checklist

• Issue number for this PR: Latest release not AOT compatible #728
• Docs included?: N/A
• Test units included?: N/A
• e2e tests included?: N/A
• In a clean directory, npm install, npm run build, and npm test run successfully? yes

Description

Fix for #728. The solution was to remove the web worker parameter as we do not support web workers with auth at the moment.

Verified no errors when building locally with @StephenFluin's aot-repo.

cc: @hansl and @chuckjaz