Trac #21318: use "correct" 1

Author: dkrenn

src/sage/combinat/recognizable_series.py

@@ -1629,7 +1629,7 @@ def one_hadamard(self):
         from sage.modules.free_module_element import vector
         from sage.rings.integer_ring import ZZ
 
-        one = ZZ(1)
+        one = self.coefficient_ring()(1)
         return self(dict((a, Matrix([[one]])) for a in self.alphabet()),
                     vector([one]), vector([one]))