Updating decoder HF config

-> fixes a previous mismatch in the naming convention of the pico decoder model

config.json

@@ -1,18 +1,18 @@
 {
   "activation_hidden_dim": 384,
   "architectures": [
-    "PicoHF"
+    "PicoDecoderHF"
   ],
   "attention_n_heads": 12,
   "attention_n_kv_heads": 4,
   "auto_map": {
-    "AutoConfig": "pico.PicoHFConfig",
-    "AutoModelForCausalLM": "pico.PicoHF"
+    "AutoConfig": "pico_decoder.PicoDecoderHFConfig",
+    "AutoModelForCausalLM": "pico_decoder.PicoDecoderHF"
   },
   "batch_size": 1024,
   "d_model": 96,
   "max_seq_len": 2048,
-  "model_type": "pico",
+  "model_type": "pico_decoder",
   "n_layers": 12,
   "norm_eps": 1e-06,
   "position_emb_theta": 10000.0,