Update cell_type_configs/k562_config.json

cell_type_configs/k562_config.json

@@ -1,5 +1,5 @@
 {
     "cell_type": "K562", 
-    "weights_file": "weights/K562_best_model_test1_val2.safetensors",
+    "weights_file": "weights/k562_best_model_test1_val2.safetensors",
     "description": "Weights trained on K562 cell line data"
 }