[FIX] trackers: Assign use_24hr_clock in Smarty for datetime.tpl to observe users_prefs_display_12hr_clock correctly in tracker plugin (should default to not using 12 hour clock - thanks marclaporte)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/11.x@46423 b456876b-0849-0410-b77d-98878d47e9d5