feat(tier4_auto_msgs_converter): remove unnecessary code (#67)

[mkuri]

Related Links

tier4/autoware.universe#309

Description

Fix to tier4/autoware.universe#309

上記PR検証時に一緒に変更

Remarks

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[TomohitoAndo]

confirmed this works.
tier4/autoware.universe#309 (comment)

[0x126]

@mkuri Is this PR no longer needed?