Remove instance ID initialization logic
Remove instance ID assignment if not set. This logic is never run since we set instance id at https://github.com/vllm-project/vllm/blob/4e95ec111cd179f2ab0f6931bf57663f828a51ec/vllm/config/vllm.py#L661-L662
Signed-off-by: Zhuohan Li <zhuohan123@gmail.com>
