update TTM-R2 model type

results/TTM-R2/config.json

@@ -1,6 +1,6 @@
 {
     "model": "TTM-R2",
-    "model_type": "pretrained",
+    "model_type": "fine-tuned",
     "model_dtype": "float32",
     "model_link": "https://huggingface.co/ibm-granite/granite-timeseries-ttm-r2"
-}
+}