[rubygems/rubygems] Make `forgotten_command_line_options` always "forget" options

https://github.com/rubygems/rubygems/commit/4d39338670

spec/bundler/support/helpers.rb

@@ -131,12 +131,10 @@ module Spec
     bang :bundle
 
     def forgotten_command_line_options(options)
-      remembered = Bundler::VERSION.split(".", 2).first == "2"
       options = options.map do |k, v|
         v = '""' if v && v.to_s.empty?
         [k, v]
       end
-      return Hash[options] if remembered
       options.each do |k, v|
         if v.nil?
           bundle! "config unset #{k}"