fix issue 23694

[AnatolyKabakov1983]

issue#23694

[dregad]

Thanks for your contribution.

After reviewing the PR, I came to the conclusion that function print_bracket_link_prepared() should be left unchanged, and marked as obsolete. As of this writing, the only usage of this function in the MantisBT codebase, is when processing the EVENT_MENU_ISSUE hook in bug_view_inc.php.

The correct way of preventing links to be wrapped with [ ] in this context, is to change the plugin hook to return an associative array of the form label => link_target, instead of cooked links.

I will provide an alternative PR.