[Misc] Fix terminal output logo coloring

[njhill]

#48938 changed the LLM part of he vLLM logo in the terminal to be blue so that it also shows up on a light background, but this doesn't look very good to me.

This changes it to use the default color bolded which will end up as white on black and black on white, which is the proper vLLM colors!

[claude]

Claude Code Review

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[mergify]

Hi @njhill, the pre-commit checks have failed. Please run:

uv pip install pre-commit>=4.5.1
pre-commit install
pre-commit run --all-files

Then, commit the changes and push to your branch.

For future commits, pre-commit will run automatically on changed files before each commit.