fix(afs): remove debugger statement from collection/changes.ts

[codediodeio]

Checklist

• Issue number for this PR: n/a
• Docs included?: not required
• Test units included?: not required
• In a clean directory, npm install, npm run build, and npm test run successfully? yes

Description

Removed a debugger statement that in changes.ts that was causing the browser to pause in debug mode whenever the modified document change occurred.

[jamesdaniels]

Thanks for the fix! I patched in #1186 too, but @davideast wants to test that change some more.