js: uncheck parent folder when a child folder is unchecked

Improve selection logic to deselect the checkbox of a folder's
parent when the checkbox is unchecked.

Based on work from Javier Hernandez.

ogcp/static/js/ogcp.js

@@ -388,7 +388,7 @@ function checkFolderParent() {
     const folder = $('input:checkbox[form|="scopesForm"][name="folder"]')
     folder.on('change', function() {
         const folder_parent = $('#' + $.escapeSelector(this.dataset.parentInput));
-        folder_parent.prop('checked', true);
+        folder_parent.prop('checked', this.checked);
     });
 }