Adjust default BarVisualizer color

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 7b32d7750d82b825e994a4e84af9c43fa4d236bb

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

| Name | Type | | --------------------------------- | ----- | | @livekit/components-styles | Patch | | @livekit/component-example-next | Patch | | @livekit/component-docs-storybook | Patch |

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[github-actions[bot]]

size-limit report 📦

Path	Size
LiveKitRoom only	5.99 KB (0%)
LiveKitRoom with VideoConference	29.76 KB (0%)
All exports	36.52 KB (0%)

[mattherzog]

What this looks like against pure white/black backgrounds.