RuboCop: fix Style/RedundantSort in app/models/import.rb (#34718).

git-svn-id: http://svn.redmine.org/redmine/trunk@21353 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/import.rb

@@ -70,7 +70,7 @@ class Import < ActiveRecord::Base
       begin
         content = File.read(filepath, 256)
 
-        separator = [',', ';'].sort_by {|sep| content.count(sep)}.last
+        separator = [',', ';'].max_by {|sep| content.count(sep)}
 
         guessed_encoding = Redmine::CodesetUtil.guess_encoding(file_content)
         encoding =