Land rapid7#3955, fix NoMethodError for wordpress_login_enum

Author: zeroSteiner

modules/auxiliary/scanner/http/wordpress_login_enum.rb

@@ -90,7 +90,7 @@ def run_host(ip)
       # Brute force previously found users
       if not usernames.empty?
         print_status("#{target_uri} - Brute-forcing previously found accounts...")
-        passwords = load_password_vars(datastore['PASS_FILE'])
+        passwords = load_password_vars
         usernames.each do |user|
           passwords.each do |pass|
             do_login(user, pass)