Fix video load bench (rerun-io#7890)

### What

I followed the example of other benches but forgot to copy the `[lib]
bench = false` setting

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* Using examples from latest `main` build:
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[rerun.io/viewer](https://rerun.io/viewer/pr/7890?manifest_url=https://app.rerun.io/version/nightly/examples_manifest.json)
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- [PR Build Summary](https://build.rerun.io/pr/7890)
- [Recent benchmark results](https://build.rerun.io/graphs/crates.html)
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crates/store/re_video/Cargo.toml

@@ -72,6 +72,8 @@ cfg_aliases.workspace = true
 [[example]]
 name = "frames"
 
+[lib]
+bench = false
 
 [[bench]]
 name = "video_load_bench"