Updates the "name" attribute in the FieldMap element. Since most screens contain a single FieldMap, the name of "default" can be used.
When the name "default" is used for a fieldmap, its name inside your programs and in the Inventu Viewer+ API will be the same as the name of the containing screen. Any other name will give the fieldmap the name "ScreenName.FieldMap" to qualify the FieldMap name.
You can use the same field map name across multiple screens, but not within a single screen.
