DecimalField precision fix

Author: PeterKharchenko

flask_mongoengine/wtf/orm.py

@@ -145,7 +145,8 @@ def conv_Float(self, model, field, kwargs):
     @converts('DecimalField')
     def conv_Decimal(self, model, field, kwargs):
         self._number_common(model, field, kwargs)
-        return f.DecimalField(places = getattr(field, 'precision', None),**kwargs)
+        kwargs['places'] = getattr(field, 'precision', None)
+        return f.DecimalField(**kwargs)
 
     @converts('BooleanField')
     def conv_Boolean(self, model, field, kwargs):