[PATCH] Improve Test Email Settings button

Came across one way to improve the Test Email Settings button. The issue was that if I click it once, it shows a text below it in response regarding whether things worked or not. When clicking it again, the status text should first disappear before reappearing to indicate that something is being done, and that the result displayed is the new one.

This can be done by changing line 445 of em-options.php from

beforeSend: function(){ $('input#em-admin-check-email').val('<?php _e('Checking...','events-manager') ?>'); },

to

beforeSend: function(){ $('input#em-admin-check-email').val('<?php _e('Checking...','events-manager') ?>'); $('#em-email-settings-check-status').html(''); },