Move login_as after creating data for a test

It doesn't really affect the tests, but it helps isolate useless
assignments, and we already did it this way 94% of the time.

spec/features/admin/admin_notifications_spec.rb

@@ -3,9 +3,8 @@ require "rails_helper"
 describe "Admin Notifications" do
 
   before do
-    admin = create(:administrator)
-    login_as(admin.user)
     create(:budget)
+    login_as(create(:administrator).user)
   end
 
   context "Show" do