Query: fix undefined variable $q in WP_Query::generate_cache_key()

The `generate_cache_key()` method in `WP_Query` referenced an undefined variable `$q`. The method only has two parameters: `$args` and `$sql`. The variable `$q` is not defined anywhere in this method scope. This patch replaces the undefined `$q` variable with the correct `$args` parameter.

Follow-up to [59442]

Props ramonopoly, westonruter

Fixes #64135.



git-svn-id: https://develop.svn.wordpress.org/trunk@61043 602fd350-edb4-49c9-b593-d223f7449a82

Author: ramonjd

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

@@ -5043,7 +5043,7 @@ protected function generate_cache_key( array $args, $sql ) {
 		}
 
 		// Add a default orderby value of date to ensure same cache key generation.
-		if ( ! isset( $q['orderby'] ) ) {
+		if ( ! isset( $args['orderby'] ) ) {
 			$args['orderby'] = 'date';
 		}