Update filter.tpl

fixed template in order to allow save settings, without the "filter_" part, the model_setting_settings->editsettings dont work because the check on line 23
if (substr($key, 0, strlen($code)) == $code) {

I don't know if this was intentionally because filter module still need attention?
Update modification.php
Merge pull request #2358 from saifwebberoo/patch-1

Update modification.php
Merge pull request #2357 from CoverUp/patch-1

Update filter.tpl
Merge pull request #2356 from jonasmello/master

Fixed smtp send mail.
Fixed save payment_method in admin edit order.