[ruby/reline] Reset IOGate in test_reset

https://github.com/ruby/reline/commit/331c1094ef

test/reline/helper.rb

@@ -21,6 +21,8 @@ module Reline
     end
 
     def test_reset
+      remove_const('IOGate') if const_defined?('IOGate')
+      const_set('IOGate', Reline::GeneralIO)
       Reline.instance_variable_set(:@core, nil)
     end
   end

test/reline/test_ansi_with_terminfo.rb

@@ -9,7 +9,6 @@ class Reline::ANSI::TestWithTerminfo < Reline::TestCase
   end
 
   def teardown
-    Reline.send(:test_mode, ansi: false) # Change IOGate back to GeneralIO
     Reline.test_reset
   end
 

test/reline/test_ansi_without_terminfo.rb

@@ -9,7 +9,6 @@ class Reline::ANSI::TestWithoutTerminfo < Reline::TestCase
   end
 
   def teardown
-    Reline.send(:test_mode, ansi: false) # Change IOGate back to GeneralIO
     Reline.test_reset
   end