Fix resetting time destroying recording stream

[Wumpf]

What

rerun::RecordingStream::reset_time accidentally destroyed the recording stream, causing it to fail/assert on any subsequent use, making the reset_time method unusable.

• test to catch this

From the looks of it the method never worked to begin with.

Checklist

• I have read and agree to Contributor Guide and the Code of Conduct
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• I have tested the web demo (if applicable):
  • Using examples from latest main build: rerun.io/viewer
  • Using full set of examples from nightly build: rerun.io/viewer
• The PR title and labels are set such as to maximize their usefulness for the next release's CHANGELOG
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• If have noted any breaking changes to the log API in CHANGELOG.md and the migration guide

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[abey79]

😅