refactor: revert unnecessary change

app/models/log.rb

@@ -31,18 +31,10 @@ class Log < ApplicationRecord
   def collection_start_year
     return @start_year if @start_year
 
-    if lettings?
-      return unless startdate
+    return unless startdate
 
-      log_start_date = startdate
-    else
-      return unless saledate
-
-      log_start_date = saledate
-    end
-
-    window_end_date = Time.zone.local(log_start_date.year, 4, 1)
-    @start_year = log_start_date < window_end_date ? log_start_date.year - 1 : log_start_date.year
+    window_end_date = Time.zone.local(startdate.year, 4, 1)
+    @start_year = startdate < window_end_date ? startdate.year - 1 : startdate.year
   end
 
   def lettings?