Redmine

This patch improves the error message displayed when attempting to delete a tracker in use.

Currently, all projects using the tracker are linked in the error message, even if the tracker is disabled for a project, leading to an incorrect issues list. This can lead to incorrect issue lists because when the tracker is disabled for a project, the issues list cannot be filtered to show issues associated with that tracker.

In the suggested fix, if the tracker is disabled, the project name is displayed as plain text instead of a link.