Remove duplicate dev_seed execution

spec/lib/tasks/dev_seed_spec.rb

@@ -2,13 +2,7 @@ require 'rails_helper'
 require 'rake'
 
 describe 'rake db:dev_seed' do
-  before do
-    Rake.application.rake_require('tasks/db')
-    Rake::Task.define_task(:environment)
-  end
-
   let :run_rake_task do
-    Rake::Task['db:dev_seed'].reenable
     Rake.application.invoke_task('db:dev_seed')
   end