bibtex remove brackets in note field

# LaTeX - It swap the field from note to addendum 
# that by default has no brackets

\DeclareSourcemap{
  \maps[datatype=bibtex]{
    \map{
      \step[fieldsource=note, final]
      \step[fieldset=addendum, origfieldval, final]
      \step[fieldset=note, null]
    }
  }
}