Remove extra line from migration

Author: lorenyu

spec/dummy/db/migrate/20250515211550_add_passport_application_form_ref_to_passport_cases.rb

@@ -1,6 +1,5 @@
 class AddPassportApplicationFormRefToPassportCases < ActiveRecord::Migration[8.0]
   def change
-    execute "DELETE FROM passport_cases"
     add_reference :passport_cases, :application_form, type: :string
   end
 end