Avoid warning on win/mac by not making the blueprint stream thread-lo…

…cal (rerun-io#5638)

### What
Enabling thread_local for the blueprint was causing a warning on
windows/mac, that in turn would cause
our e2e tests to fail.

### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [x] I've included a screenshot or gif (if applicable)
* [x] I have tested the web demo (if applicable):
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* Using full set of examples from `nightly` build:
[app.rerun.io](https://app.rerun.io/pr/5638/index.html?manifest_url=https://app.rerun.io/version/nightly/examples_manifest.json)
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checklist](https://github.com/rerun-io/rerun/blob/main/tests/python/release_checklist)!

- [PR Build Summary](https://build.rerun.io/pr/5638)
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rerun_py/rerun_sdk/rerun/blueprint/api.py

@@ -478,9 +478,15 @@ def create_in_memory_blueprint(*, application_id: str, blueprint: BlueprintLike)
     # Convert the BlueprintLike to a full blueprint
     blueprint = blueprint.to_blueprint()
 
+    # We only use this stream object directly, so don't need to make it
+    # default or thread default. Making it the thread-default will also
+    # lead to an unnecessary warning on mac/win.
     blueprint_stream = RecordingStream(
         bindings.new_blueprint(
             application_id=application_id,
+            make_default=False,
+            make_thread_default=False,
+            default_enabled=True,
         )
     )