Disable lr override (#6472)

Signed-off-by: Gautham Kollu <gkollu@nvidia.com>

Author: gautham-kollu

src/megatron/bridge/perf_recipes/deepseek/gb300/deepseek_v3.py

@@ -398,9 +398,6 @@ def deepseek_v3_pretrain_256gpu_gb300_fp8mx_hsdp_config() -> ConfigContainer:
     cfg.ddp.expert_outer_dp_sharding_strategy = "no_shard"
     cfg.ddp.num_distributed_optimizer_instances = 4
 
-    cfg.optimizer.lr = 3e-7
-    cfg.optimizer.min_lr = 1e-7
-
     cfg.model.fp8_param_gather = True
     cfg.model.fp8_param = True
     cfg.model.moe_router_dtype = "bf16"