[Bugfix] Number of shared_experts_fusion should set by user.

Number of shared_experts_fusion should set by user.
Not enable DeepSeek V3 shared_experts_fusion in sm90 (sgl-project#5571) by default.

Signed-off-by: miter <[email protected]>

Author: MiterV1

python/sglang/srt/models/deepseek_v2.py

@@ -1690,11 +1690,9 @@ def determine_n_share_experts_fusion(
                 and self.config.n_routed_experts == 256
                 and (not global_server_args_dict["enable_deepep_moe"])
             ):
-                self.n_share_experts_fusion = self.tp_size
-                global_server_args_dict["n_share_experts_fusion"] = self.tp_size
                 log_info_on_rank0(
                     logger,
-                    "Deepseek V3/R1 with fp8 can use shared experts fusion optimization when SM version >=90. Shared experts fusion optimization is enabled.",
+                    "Deepseek V3/R1 with fp8 can use shared experts fusion optimization when SM version >=90. Shared experts fusion optimization is not enabled.",
                 )
 
     def get_input_embeddings(self) -> nn.Embedding: