Enable Style/MethodDefParentheses rubocop cop

Use def with parentheses when there are parameters.

See #17478

.rubocop.yml

@@ -330,7 +330,7 @@ Style/MethodCallParentheses:
 
 # Checks if the method definitions have or don't have parentheses.
 Style/MethodDefParentheses:
-  Enabled: false
+  Enabled: true
 
 # Use the configured style when naming methods.
 Style/MethodName:

app/controllers/omniauth_callbacks_controller.rb

@@ -97,7 +97,7 @@ class OmniauthCallbacksController < Devise::OmniauthCallbacksController
     handle_signup_error
   end
 
-  def handle_service_ticket provider, ticket
+  def handle_service_ticket(provider, ticket)
     Gitlab::OAuth::Session.create provider, ticket
     session[:service_tickets] ||= {}
     session[:service_tickets][provider] = ticket

app/models/ci/build.rb

@@ -286,7 +286,7 @@ module Ci
       project.runners_token
     end
 
-    def valid_token? token
+    def valid_token?(token)
       project.valid_runners_token? token
     end
 

app/models/project.rb

@@ -946,13 +946,13 @@ class Project < ActiveRecord::Base
     shared_runners_enabled? && Ci::Runner.shared.active.any?(&block)
   end
 
-  def valid_runners_token? token
+  def valid_runners_token?(token)
     self.runners_token && ActiveSupport::SecurityUtils.variable_size_secure_compare(token, self.runners_token)
   end
 
   # TODO (ayufan): For now we use runners_token (backward compatibility)
   # In 8.4 every build will have its own individual token valid for time of build
-  def valid_build_token? token
+  def valid_build_token?(token)
     self.builds_enabled? && self.runners_token && ActiveSupport::SecurityUtils.variable_size_secure_compare(token, self.runners_token)
   end