[ruby/reline] Revert "correct Win32API capitalization for JRuby"

This reverts commit https://github.com/ruby/reline/commit/d6e7c9e1d9af.

https://github.com/ruby/reline/commit/c47a5b684c

lib/reline/windows.rb

@@ -53,7 +53,7 @@ class Reline::Windows
   end
 
   if defined? JRUBY_VERSION
-    require 'Win32API'
+    require 'win32api'
   else
     class Win32API
       DLL = {}