Update variable name

app/models/form/lettings/questions/previous_let_type.rb

@@ -7,7 +7,7 @@ class Form::Lettings::Questions::PreviousLetType < ::Form::Question
     @type = "radio"
     @check_answers_card_number = 0
     @hint_text = form.start_year_after_2024? ? "This is the rent type of the previous tenancy in this property." : ""
-    @answer_options = form.start_year_after_2024? ? ANSWER_OPTIONS_2024 : ANSWER_OPTIONS
+    @answer_options = form.start_year_after_2024? ? ANSWER_OPTIONS_AFTER_2024 : ANSWER_OPTIONS
     @question_number = 16
   end
 
@@ -22,7 +22,7 @@ class Form::Lettings::Questions::PreviousLetType < ::Form::Question
     "3" => { "value" => "Don’t know" },
   }.freeze
 
-  ANSWER_OPTIONS_2024 = {
+  ANSWER_OPTIONS_AFTER_2024 = {
     "1" => { "value" => "Social rent basis" },
     "2" => { "value" => "Affordable rent basis" },
     "5" => { "value" => "London Affordable Rent basis" },