Land rapid7#7646, get_cookies fix for dolibarr_login

Author: wvu

modules/auxiliary/scanner/http/dolibarr_login.rb

@@ -46,7 +46,7 @@ def get_sid_token
     return [nil, nil] if res.nil? || res.get_cookies.empty?
 
     # Get the session ID from the cookie
-    m = get_cookies.match(/(DOLSESSID_.+);/)
+    m = res.get_cookies.match(/(DOLSESSID_.+);/)
     id = (m.nil?) ? nil : m[1]
 
     # Get the token from the decompressed HTTP body response