Taxonomy: Fix deprecated calls to get_terms().

The taxonomy should be passed as part of `$args`, rather than as its own argument.

Props sgastard, mukesh27, SergeyBiryukov.
Fixes #47819.

git-svn-id: https://develop.svn.wordpress.org/trunk@45723 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-term-query.php

@@ -428,8 +428,8 @@ class WP_Term_Query {
 				$excluded_children = array_merge(
 					$excluded_children,
 					(array) get_terms(
-						reset( $taxonomies ),
 						array(
+							'taxonomy'   => reset( $taxonomies ),
 							'child_of'   => intval( $extrunk ),
 							'fields'     => 'ids',
 							'hide_empty' => 0,