Fix RSpec/InstanceVariable cop (#27766)

spec/controllers/statuses_cleanup_controller_spec.rb

@@ -5,9 +5,10 @@ require 'rails_helper'
 RSpec.describe StatusesCleanupController do
   render_views
 
+  let!(:user) { Fabricate(:user) }
+
   before do
-    @user = Fabricate(:user)
-    sign_in @user, scope: :user
+    sign_in user, scope: :user
   end
 
   describe 'GET #show' do
@@ -30,9 +31,9 @@ RSpec.describe StatusesCleanupController do
     end
 
     it 'updates the account status cleanup policy' do
-      expect(@user.account.statuses_cleanup_policy.enabled).to be true
-      expect(@user.account.statuses_cleanup_policy.keep_direct).to be false
-      expect(@user.account.statuses_cleanup_policy.keep_polls).to be true
+      expect(user.account.statuses_cleanup_policy.enabled).to be true
+      expect(user.account.statuses_cleanup_policy.keep_direct).to be false
+      expect(user.account.statuses_cleanup_policy.keep_polls).to be true
     end
 
     it 'redirects' do