Undefine check method and let the base class do it

Preserve the to-do without rewording - should be enough.

modules/exploits/windows/smb/ms17_010_eternalblue.rb

@@ -106,10 +106,7 @@ class MetasploitModule < Msf::Exploit::Remote
   class EternalBlueError < StandardError
   end
 
-  def check
   # todo: create MS17-010 mixin, and hook up auxiliary/scanner/smb/smb_ms17_010
-    CheckCode::Unsupported
-  end
 
   def exploit
     begin