remove duplicate instance methods sso_secret and sso_url

.rubocop_todo.yml

@@ -23,11 +23,6 @@ Lint/ConstantDefinitionInBlock:
     - 'spec/validators/date_time_string_validator_spec.rb'
     - 'spec/validators/integer_array_validator_spec.rb'
 
-# Offense count: 2
-Lint/DuplicateMethods:
-  Exclude:
-    - 'lib/discourse/single_sign_on.rb'
-
 # Offense count: 16
 # Configuration parameters: AllowComments, AllowEmptyLambdas.
 Lint/EmptyBlock:

lib/discourse/single_sign_on.rb

@@ -12,7 +12,7 @@ module Discourse
              :suppress_welcome_message].freeze
     NONCE_EXPIRY_TIME = 10.minutes
 
-    attr_accessor(*ACCESSORS, :sso_secret, :sso_url)
+    attr_accessor(*ACCESSORS)
 
     def self.sso_secret
       raise "sso_secret not implemented on class, be sure to set it on instance"