Taxonomy: Improve backward compatibility on the wp-admin/term.php page.

Specifically, run `do_action( 'edit-tags.php' );` on this new term edit page introduced in [36308]. Changes the GET param back to `tag_ID` and properly sets the screen base in `WP_Screen`.

See #34988.

git-svn-id: https://develop.svn.wordpress.org/trunk@36874 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/link-template.php

@@ -928,7 +928,7 @@ function get_edit_term_link( $term_id, $taxonomy = '', $object_type = '' ) {
 
 	$args = array(
 		'taxonomy' => $taxonomy,
-		'term_id'  => $term->term_id,
+		'tag_ID'   => $term->term_id,
 	);
 
 	if ( $object_type ) {