[Filebeat] Fix Zoom module config for url and basic auth

[andrewkroh]

What does this PR do?

The basic auth username and password options were broken. And the url parameter was
missing from the config despite being defined in the manifest.

Why is it important?

The option to host the webhook callback as a prefix other than / is not possible.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[elasticmachine]

💚 Build Succeeded

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Build stats

• Build Cause: Pull request #23779 opened

• • Start Time: 2021-02-01T13:09:20.861+0000

• Duration: 43 min 4 sec

• Commit: 3593cc8

Test stats 🧪

Test	Results
Failed	0
Passed	6786
Skipped	1049
Total	7835

💚 Flaky test report

Tests succeeded.

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Test stats 🧪

Test	Results
Failed	0
Passed	6786
Skipped	1049
Total	7835