Form reset broken

A typo in the new logic prevents forms being reset. This is a simple fix...

from:
$display_id = ($this->view->display_handler->is_defaulted('filters')) ? 'default' : $this->current_display;

to:
$display_id = ($this->view->display_handler->is_defaulted('filters')) ? 'default' : $this->view->current_display;

(Full patch attached)