refactor(types): remove dead catch-all clauses unreachable per success typing

lib/mv_web/live/member_live/index/field_selection.ex

@@ -103,8 +103,6 @@ defmodule MvWeb.MemberLive.Index.FieldSelection do
     end)
   end
 
-  defp parse_cookie_header(_), do: %{}
-
   @doc """
   Saves field selection to cookie.
 
@@ -218,8 +216,6 @@ defmodule MvWeb.MemberLive.Index.FieldSelection do
     end
   end
 
-  defp parse_json(_), do: %{}
-
   # Parses a comma-separated string of field names
   defp parse_fields_string(fields_string) do
     fields_string