Use session object instead of self

The session object has :process_autoruns, not self

Author: wchen-r7

lib/msf/core/handler.rb

@@ -248,8 +248,8 @@ def register_session(session)
       session.bootstrap(datastore, self)
     else
       # Process the auto-run scripts for this session
-      if self.respond_to?(:process_autoruns)
-        self.process_autoruns(datastore)
+      if session.respond_to?(:process_autoruns)
+        session.process_autoruns(datastore)
       end
       on_session(session)
     end