Fix 0012635: Prevent double escape of bug summaries on view page

If one puts "#bug_number" in a bug summary, mantis doesn't display the
link correctly - instead of link, one gets "/view.php?id=489610"

Reproduced by:
1) Report an issue
2) Put "#bug_number" in the summary, as a quick reference to another bug
3) View the reported issue (the "view.php" page)
4) Look on the summary on the view page.

This issue was caused by a double escaping of the bug summary.