fix replay perception obstacle velocity direction

[xiafawu]

The obstacles generated from the replay perception script have velocity direction not conforming to their actual movement. For instance, an obstacle might be traveling straight towards the north while its velocity direction points to the east. This updated script should resolve this problem.

I've recorded two videos comparing the original script and the script from the pull request, both taking /apollo/modules/tools/perception/garage_onroad_vehicle_3.json as input. The new script has correct velocity direction while the original script has velocity direction pointing elsewhere.

And here is a quick peek of the change: original

pull request

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