fix text obfuscation logic

[Vadman97]

Summary

innerHTML changes would not be obfuscated properly in default obfuscation mode.
highlight/rrweb#116

fixes HIG-3970

How did you test this change?

before

after

Are there any deployment considerations?

new changeset

Does this work require review from our design team?

no

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[SpennyNDaJets]

Overall think this is the fix we want. Not sure if we want to include in this PR but from our conversation, we still need to:

• Confirm our edge case
  • incremental update through texts, only been able to update through adds which was working properly
  • see comment above
• Add end-to-end tests

[linear]

HIG-3970 smart obfuscation not blocking PII in dom

[Vadman97]

better e2e tests coming in https://linear.app/highlight/issue/HIG-4345/e2e-test-for-obfuscation