refresh loop iOS device

The plugin was causing a refresh loop on iOS (13.) devices, only on products/pages with sales countdown activated.

fixed that on wp-content/plugins/sales-countdown-timer/js/shortcode.js

44c44
<         countdown_time_start =   new Date(countdown_time_start+'Z');
---
>         countdown_time_start =   new Date(countdown_time_start.replace(' ', 'T')+'Z');
46c46
<         countdown_time_end =   new Date(countdown_time_end+'Z');
---
>         countdown_time_end =   new Date(countdown_time_end.replace(' ', 'T')+'Z');

consider taking a look for your next update.

thank you.