[Fix] fix sglang not using validate flag in gen seq func

[spacegoing]

As discussed here: #1089

sglang generate_sequences() doesn't use validate flag as vllm did:

verl/verl/workers/rollout/vllm_rollout/vllm_rollout.py

Lines 185 to 202 in 5c984b7

	is_validate = prompts.meta_info.get('validate', False)
	if not do_sample:
	kwargs = {
	'best_of': 1,
	'top_p': 1.0,
	'top_k': -1,
	'min_p': 0.0,
	'temperature': 0,
	'n': 1 # if greedy, only 1 response
	}
	elif is_validate:
	# TODO: try **
	kwargs = {
	'top_k': self.config.val_kwargs.top_k,
	'top_p': self.config.val_kwargs.top_p,
	'temperature': self.config.val_kwargs.temperature,
	'n': 1, # if validate, already repeat in ray_trainer
	}

copied vllm's code in this commit

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