Revert "change Metasploit3 class names"

This reverts commit 666ae14259.

modules/exploits/multi/browser/java_atomicreferencearray.rb

@@ -6,7 +6,7 @@
 require 'msf/core'
 require 'rex'
 
-class Metasploit < Msf::Exploit::Remote
+class Metasploit3 < Msf::Exploit::Remote
   Rank = ExcellentRanking
 
   include Msf::Exploit::Remote::HttpServer::HTML