Fix Lint/UselessAccessModifier warnings reported by rubocop.

.rubocop_todo.yml

@@ -5,10 +5,6 @@
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
-# Offense count: 3
-Lint/UselessAccessModifier:
-  Enabled: false
-
 # Offense count: 30
 Lint/UselessAssignment:
   Enabled: false

lib/app/presenters/tracks.rb

@@ -41,8 +41,6 @@ def self.planned
         @@planned ||= tracks.select(&:planned?)
       end
 
-      private
-
       def self.fetch_tracks
         status, body = Xapi.get("tracks")
         if status != 200

lib/exercism/submission.rb

@@ -222,8 +222,6 @@ def participant_submissions(current_user = nil)
     end
   end
 
-  private
-
   # Experiment: Cache the iteration number so that we can display it
   # on the dashboard without pulling down all the related versions
   # of the submission.

lib/exercism/submission_status.rb

@@ -35,8 +35,6 @@ def self.users_who_have_completed_or_are_working_on(problem, user_relation: nil)
     user_relation.includes(:submissions).where(*working_or_done_sql_query(problem)).references(:submissions)
   end
 
-  private
-
   def self.completed_problem_hash(problem)
     {
       :language => problem.track_id,
@@ -65,4 +63,3 @@ def self.working_or_done_sql_query(problem)
   end
 
 end
-

lib/jobs/hello.rb

@@ -5,7 +5,7 @@ class Hello
     include Sidekiq::Worker
     sidekiq_options :queue => :hello
 
-    def perform(submission_uuid)
+    def perform(_)
       # This exists solely to get the job scheduled.
       # There is a stand-alone worker that processes
       # the jobs.