[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

spectrafit/models/builtin.py

@@ -954,7 +954,7 @@ def model_check(self, model: str) -> None:
             NotImplementedError: If the model is not implemented.
 
         """
-        model_prefix = model.split("_")[0]
+        model_prefix = model.split("_", maxsplit=1)[0]
 
         # Check in main models list
         if (