Remove test TODO comments that have been confirmed by E2E tests

Author: aycabta

test/reline/test_reline.rb

@@ -364,22 +364,10 @@ def test_readline
  assert_include(Reline.private_instance_methods, :readline)
  end
 
- def test_inner_readline
- # TODO in Reline::Core
- end
-
  def test_read_io
  # TODO in Reline::Core
  end
 
- def test_read_escaped_key
- # TODO in Reline::Core
- end
-
- def test_may_req_ambiguous_char_width
- # TODO in Reline::Core
- end
-
  def get_reline_encoding
  if encoding = Reline::IOGate.encoding
  encoding