[ruby/reline] Reset config for random test

https://github.com/ruby/reline/commit/c39615e1dd

test/reline/test_within_pipe.rb

@@ -22,6 +22,7 @@ class Reline::WithinPipeTest < Reline::TestCase
     @reader.close
     @output_writer.close
     @config.reset
+    @config.reset_default_key_bindings
   end
 
   def test_simple_input