edit-vacation: fix second postgresql issue (removing vacation)

git-svn-id: https://svn.code.sf.net/p/postfixadmin/code/trunk@708 a1433add-5e2c-0410-b055-b7f2511e0802

edit-vacation.php

@@ -117,7 +117,7 @@ if ($_SERVER['REQUEST_METHOD'] == "POST")
       {
          $db_false = db_get_boolean(false);
          // retain vacation message if possible - i.e disable vacation away-ness.
-         $result = db_query ("UPDATE $table_vacation SET active = $db_false WHERE email='$fUsername'");
+         $result = db_query ("UPDATE $table_vacation SET active = '$db_false' WHERE email='$fUsername'");
          $result = db_query("DELETE FROM $table_vacation_notification WHERE on_vacation='$fUsername'");
 
          $result = db_query ("SELECT * FROM $table_alias WHERE address='$fUsername'");