fix: remove @locations in location model

app/models/location.rb

@@ -384,7 +384,7 @@ class Location < ApplicationRecord
 
   def deactivation_date_errors(params)
     if params[:location][:deactivation_date].blank? && params[:location][:deactivation_date_type].blank?
-      @location.errors.add(:deactivation_date_type, message: I18n.t("validations.location.deactivation_date.not_selected"))
+      .errors.add(:deactivation_date_type, message: I18n.t("validations.location.deactivation_date.not_selected"))
     end
 
     if params[:location][:deactivation_date_type] == "other"
@@ -395,11 +395,11 @@ class Location < ApplicationRecord
       collection_start_date = FormHandler.instance.current_collection_start_date
 
       if [day, month, year].any?(&:blank?)
-        @location.errors.add(:deactivation_date, message: I18n.t("validations.location.deactivation_date.not_entered"))
+        errors.add(:deactivation_date, message: I18n.t("validations.location.deactivation_date.not_entered"))
       elsif !Date.valid_date?(year.to_i, month.to_i, day.to_i)
-        @location.errors.add(:deactivation_date, message: I18n.t("validations.location.deactivation_date.invalid"))
+        errors.add(:deactivation_date, message: I18n.t("validations.location.deactivation_date.invalid"))
       elsif !Date.new(year.to_i, month.to_i, day.to_i).between?(collection_start_date, Date.new(2200, 1, 1))
-        @location.errors.add(:deactivation_date, message: I18n.t("validations.location.deactivation_date.out_of_range", date: collection_start_date.to_formatted_s(:govuk_date)))
+        errors.add(:deactivation_date, message: I18n.t("validations.location.deactivation_date.out_of_range", date: collection_start_date.to_formatted_s(:govuk_date)))
       end
     end
   end