Use section sign instead of Hiragana Letter A

It can convert to Windows-1252and Windows-31J.

```
"\u00a7".encode("Windows-1252") #=> "\xA7"
"\u00a7".encode("Windows-31J")  #=> "\x{8198}"
```

https://github.com/ruby/ruby/runs/788357527?check_suite_focus=true#step:14:959
```
  1) Failure:
WEBrick::TestFileHandler#test_cjk_in_path [D:/a/ruby/ruby/src/test/webrick/utils.rb:72]:
exceptions on 2 threads:
webrick log start:
  [2020-06-19 14:49:38] ERROR Encoding::CompatibilityError: incompatible character encodings: ASCII-8BIT and Windows-1252
  	D:/a/ruby/ruby/src/lib/webrick/httpservlet/filehandler.rb:341:in `+'
  	D:/a/ruby/ruby/src/lib/webrick/httpservlet/filehandler.rb:341:in `set_filename'
  	D:/a/ruby/ruby/src/lib/webrick/httpservlet/filehandler.rb:310:in `exec_handler'
  	D:/a/ruby/ruby/src/lib/webrick/httpservlet/filehandler.rb:245:in `do_GET'
  	D:/a/ruby/ruby/src/lib/webrick/httpservlet/abstract.rb:105:in `service'
  	D:/a/ruby/ruby/src/lib/webrick/httpservlet/filehandler.rb:241:in `service'
  	D:/a/ruby/ruby/src/lib/webrick/httpserver.rb:140:in `service'
  	D:/a/ruby/ruby/src/lib/webrick/httpserver.rb:96:in `run'
  	D:/a/ruby/ruby/src/lib/webrick/server.rb:307:in `block in start_thread'
```

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