Change Citation filter gramplet's default/reset for "Min. Conf." to "Very low" or null

feature request was filed Jun 2020 but was never set to be a 5.2 target as requested
0011797 feedback • Feature Requests • [Citation Confidence Levels]Change “Min. Conf.” to be set to “Very Low” by default, so that all citations are shown by default

the following Discourse discussion included a patch but it was not filed as a PR nor associated with the Feature request. reference to Discourse added to feature request