Fix the issue 7589, both RHOST and RHOSTS options are quired

Thanks to Will who found it's due to the order of mixin.

Author: jinq102030

modules/auxiliary/scanner/http/buffalo_login.rb

@@ -8,8 +8,8 @@
 require 'metasploit/framework/login_scanner/buffalo'
 
 class MetasploitModule < Msf::Auxiliary
-  include Msf::Auxiliary::Scanner
   include Msf::Exploit::Remote::HttpClient
+  include Msf::Auxiliary::Scanner
   include Msf::Auxiliary::Report
   include Msf::Auxiliary::AuthBrute