rubocop fixes

Author: loiswells97

app/controllers/api/lessons_controller.rb

@@ -13,10 +13,10 @@ def index
       lessons_with_users = ordered_scope.accessible_by(current_ability).with_users
       remixes = ordered_scope.map do |lesson|
         lesson.project.remixes
-          .where(user_id: current_user.id)
-          .accessible_by(current_ability)
-          .order(created_at: :asc)
-          .first
+              .where(user_id: current_user.id)
+              .accessible_by(current_ability)
+              .order(created_at: :asc)
+              .first
       end
       @lessons_with_users_and_remixes = lessons_with_users.zip(remixes)
       render :index, formats: [:json], status: :ok

app/views/api/lessons/index.json.jbuilder

@@ -28,7 +28,5 @@ json.array!(@lessons_with_users_and_remixes) do |lesson_with_user, remix|
 
   json.user_name(user&.name)
 
-  if remix.present?
-    json.remix_identifier(remix.identifier)
-  end
+  json.remix_identifier(remix.identifier) if remix.present?
 end