[Misc] Clean up redundant code in uniproc_executor.py (#16762)

Signed-off-by: Lifu Huang <lifu.hlf@gmail.com>

vllm/executor/uniproc_executor.py

@@ -34,13 +34,13 @@ class UniProcExecutor(ExecutorBase):
         if len(device_info) > 1:
             local_rank = int(device_info[1])
         rank = 0
+        is_driver_worker = True
         kwargs = dict(
             vllm_config=self.vllm_config,
             local_rank=local_rank,
             rank=rank,
             distributed_init_method=distributed_init_method,
-            is_driver_worker=(not self.parallel_config)
-            or (rank % self.parallel_config.tensor_parallel_size == 0),
+            is_driver_worker=is_driver_worker,
         )
         self.collective_rpc("init_worker", args=([kwargs], ))
         self.collective_rpc("init_device")