feat(member): bring the overview table up to WCAG 2.2 AA

lib/mv_web/live/member_live/index.ex

@@ -767,8 +767,15 @@ defmodule MvWeb.MemberLive.Index do
           custom_field: custom_field,
           render: fn member ->
             case get_custom_field_value(member, custom_field) do
-              nil -> ""
-              cfv -> Formatter.format_custom_field_value(cfv.value, custom_field)
+              nil ->
+                ""
+
+              cfv ->
+                if custom_field.value_type == :boolean do
+                  extract_boolean_value(cfv.value)
+                else
+                  Formatter.format_custom_field_value(cfv.value, custom_field)
+                end
             end
           end
         }