report state changes in "select columns to display" menu (#16400)
fixes #16323
Summary of the issue:
When selecting columns to display in Thunderbird message list, column state (checked or not checked) is not automatically spoken or shown in braille when state changes.
Description of user facing changes
Column state is automatically spoken and shown in braille when it changes.
Description of development approach
Added nameChange event to thunderbird.AppModule.
