CLDC-4177: remove frozen string literals

app/models/form/sales/pages/person_sex_registered_at_birth.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 class Form::Sales::Pages::PersonSexRegisteredAtBirth < ::Form::Page
   def initialize(id, hsh, subsection, person_index:)
     super(id, hsh, subsection)

app/models/form/sales/pages/sex_registered_at_birth1.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 class Form::Sales::Pages::SexRegisteredAtBirth1 < ::Form::Page
   def initialize(id, hsh, subsection)
     super

app/models/form/sales/pages/sex_registered_at_birth2.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 class Form::Sales::Pages::SexRegisteredAtBirth2 < ::Form::Page
   def initialize(id, hsh, subsection)
     super

app/models/form/sales/questions/person_sex_registered_at_birth.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 class Form::Sales::Questions::PersonSexRegisteredAtBirth < ::Form::Question
   def initialize(id, hsh, page, person_index:)
     super(id, hsh, page)

app/models/form/sales/questions/sex_registered_at_birth1.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 class Form::Sales::Questions::SexRegisteredAtBirth1 < ::Form::Question
   def initialize(id, hsh, page)
     super

app/models/form/sales/questions/sex_registered_at_birth2.rb

@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 class Form::Sales::Questions::SexRegisteredAtBirth2 < ::Form::Question
   def initialize(id, hsh, page)
     super