Remove NoMethod Rescue for cerberus_sftp_enumusers

Please see reasons in rapid7#9436

Author: wchen-r7

modules/auxiliary/scanner/ssh/cerberus_sftp_enumusers.rb

@@ -118,10 +118,7 @@ def check_user(ip, user, port)
 
     begin
       ::Timeout.timeout(datastore['SSH_TIMEOUT']) do
-        begin
-          auth.authenticate("ssh-connection", user, pass)
-        rescue NoMethodError
-        end
+        auth.authenticate("ssh-connection", user, pass)
         auth_method = auth.allowed_auth_methods.join('|')
         if auth_method != ''
           :success