bibtex remove brackets in note field

1# LaTeX - It swap the field from note to addendum 
2# that by default has no brackets
3
4\DeclareSourcemap{
5  \maps[datatype=bibtex]{
6    \map{
7      \step[fieldsource=note, final]
8      \step[fieldset=addendum, origfieldval, final]
9      \step[fieldset=note, null]
10    }
11  }
12}