Don't email bomb admin on ticket rejections

Disable email alert sent to admin when a warning is logged due to ticket
rejection e.g when banned email or max open limit is reached.

include/class.ticket.php

@@ -2197,7 +2197,8 @@ class Ticket {
                         'errno' => 403,
                         'err' => 'This help desk is for use by authorized
                         users only');
-                $ost->logWarning('Ticket denied', 'Banned email - '.$vars['email']);
+                $ost->logWarning('Ticket denied', 'Banned email - '
+                    .$vars['email'], true);
                 return 0;
             }
 
@@ -2211,7 +2212,8 @@ class Ticket {
                 $errors = array('err' => "You've reached the maximum open tickets allowed.");
                 $ost->logWarning('Ticket denied -'.$vars['email'],
                         sprintf('Max open tickets (%d) reached for %s ',
-                            $cfg->getMaxOpenTickets(), $vars['email']));
+                            $cfg->getMaxOpenTickets(), $vars['email']),
+                        false);
 
                 return 0;
             }
@@ -2228,7 +2230,7 @@ class Ticket {
                     only");
             $ost->logWarning('Ticket denied',
                     sprintf('Ticket rejected ( %s) by filter "%s"',
-                        $vars['email'], $filter->getName()));
+                        $vars['email'], $filter->getName()), true);
 
             return 0;
         }