Remove extra `devise` call that got added by accident

app/models/user.rb

@@ -62,9 +62,6 @@ require 'carrierwave/orm/activerecord'
 require 'file_size_validator'
 
 class User < ActiveRecord::Base
-  devise :two_factor_authenticatable,
-         otp_secret_encryption_key: File.read(Rails.root.join('.secret')).chomp
-
   include Sortable
   include Gitlab::ConfigHelper
   include TokenAuthenticatable