Fixed typo in JSON

Removing the comma fixed the following warning from being raised
```OSError(f"It looks like the config file at '{resolved_config_file}' is not a valid JSON file.")```

config.json

@@ -1,4 +1,4 @@
 {
   "_name_or_path": "made-with-clay/Clay",
-  "model_type": "geovit+DOFA",
+  "model_type": "geovit+DOFA"
 }