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/deprecated.php

@@ -1287,7 +1287,13 @@ function get_all_category_ids() {
 	_deprecated_function( __FUNCTION__, '4.0.0', 'get_terms()' );
 
 	if ( ! $cat_ids = wp_cache_get( 'all_category_ids', 'category' ) ) {
-		$cat_ids = get_terms( 'category', array('fields' => 'ids', 'get' => 'all') );
+		$cat_ids = get_terms(
+			array(
+				'taxonomy' => 'category',
+				'fields'   => 'ids',
+				'get'      => 'all',
+			)
+		);
 		wp_cache_add( 'all_category_ids', $cat_ids, 'category' );
 	}