Fix backup download link — missing file= query parameter (#970)

The download link was generated as /admin/backups/?filename.zip
but the download handler checks $_GET['file'], so the handler
was never triggered. The browser navigated to the page instead
of downloading the file, causing a JS error.

Changed: url('admin/backups') . '/?' . $entry
To:      url('admin/backups') . '?file=' . $entry

Author: uAliAmer

resources/views/components/config/backups.blade.php

@@ -113,7 +113,7 @@
             while (false !== ($entry = readdir($handle))) {
                 if ($entry != '.' && $entry != '..') {
                     $entrys = substr($entry, 17);
-                    echo '<div class="button-entrance"><a class="buttondm button-hover icon-hover" style="color:#ffffff; background-color:#000;" href="' . url('admin/backups') . '/?' . $entry . '"><i style="color: " class="icon hvr-icon fa fa-download"></i>&nbsp; ';
+                    echo '<div class="button-entrance"><a class="buttondm button-hover icon-hover" style="color:#ffffff; background-color:#000;" href="' . url('admin/backups') . '?file=' . $entry . '"><i style="color: " class="icon hvr-icon fa fa-download"></i>&nbsp; ';
                     print_r($entrys);
                     echo '</a></div><br>';
                 }