Fix an error "uninitialized constant Redmine::Twofa::Base" when accessing My account in production mode (#1237, #33932).

git-svn-id: http://svn.redmine.org/redmine/trunk@19997 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/twofa/totp.rb

@@ -17,6 +17,8 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
+require_relative 'base'
+
 module Redmine
   module Twofa
     class Totp < Base