fix(vllm-omni): remove invalid syntax in test.py

[H-XX-D]

What does this PR do?

Fixes a SyntaxError: invalid decimal literal in backend/python/vllm-omni/test.py.

A stray string fragment (additional_information) was concatenated with seed=42 on line 71 (seed=42additional_information) and placed as an isolated identifier on line 81, preventing the test module from being parsed or executed by Python interpreters.

Changes

• Cleaned seed=42additional_information to seed=42 in GenerateImageRequest
• Removed stray additional_information token above if __name__ == "__main__":

[localai-org-maint-bot]

@mudler code review looks good at e4315c8. This removes exactly the two stray additional_information tokens still present on latest master: one makes the numeric literal invalid, and the other would raise NameError at module import. No other test behavior changes.

The patch applies cleanly to master 8b01583 and git diff --check passes. DCO passes. I could not run Python parsing or the backend suite here because this environment has no Python interpreter; no substantive CI results are available yet. Good to merge from the code-review side, with runtime validation still pending.