fixes #7080: symbols are no longer being sorted

I think this is the only new line, but I can't see how it helps.  There's no string conversion happening.. so this still generates a hash of symbols to values:

    [5] pry(#<Proxy::RootPlugin>)> settings.defaults.select {|k,v| settings.used_defaults.include?(k)}.inject({}) {|acc, c| acc[c[0]] = c[1]; acc}
    => {:enabled=>true}

Which will fail again when you call .sort on 140.