fix: correct CONFIG_FILE path in multinode_trainer script (#1374)

Author: idoh

multinode_trainer.slurm

@@ -54,7 +54,7 @@ export NCCL_BUFFSIZE=2097152
 #export TORCH_DIST_INIT_BARRIER=1
 export FI_EFA_SET_CUDA_SYNC_MEMOPS=0
 
-CONFIG_FILE=${CONFIG_FILE:-"./torchtitan/models/llama/train_configs/llama3_8b.toml"}
+CONFIG_FILE=${CONFIG_FILE:-"./torchtitan/models/llama3/train_configs/llama3_8b.toml"}
 
 dcgmi profile --pause
 # adjust sbatch --ntasks and sbatch --nodes above and --nnodes below