Fix for bug in displaying todos in activities page

- fixed bad url like solved by hshield in commit https://github.com/hshield/redmine-todos-scrum-plugin/commit/2a8125efd97975d85658815e4481ffaf4a46e1ea
- removed obsolete commented codelines
Merge branch 'master' of https://github.com/asinteg/redmine_todo_scrum_plugin