add signing form specs

spec/factories/submitters.rb

@@ -5,7 +5,6 @@ FactoryBot.define do
     submission
     email { Faker::Internet.email }
     name { Faker::Name.name }
-    phone { Faker::PhoneNumber.phone_number }
 
     before(:create) do |submitter, _|
       submitter.account_id = submitter.submission.account_id