unit test found bug for method call in default case: fixed

Author: asmirnov69

pandas_flavor/register.py

@@ -115,7 +115,7 @@ def __init__(self, pandas_obj):
             def __call__(self, *args, **kwargs):
                 global method_call_ctx_factory
                 if method_call_ctx_factory is None:
-                    return method(obj, *args, **kwargs)
+                    return method(self._obj, *args, **kwargs)
 
                 return handle_pandas_extension_call(
                     method, method_signature, self._obj, args, kwargs
@@ -144,7 +144,7 @@ def __init__(self, pandas_obj):
             def __call__(self, *args, **kwargs):
                 global method_call_ctx_factory
                 if method_call_ctx_factory is None:
-                    return method(obj, *args, **kwargs)
+                    return method(self._obj, *args, **kwargs)
 
                 return handle_pandas_extension_call(
                     method, method_signature, self._obj, args, kwargs