Tests: Correct the wp_theme_json_data_default filter name in assert…

…ion messages.

The `theme_json_default` filter was previously renamed to `wp_theme_json_data_default`.

This commit updates the messages in `WP_Theme_JSON_Resolver` tests to match the new name.

Follow-up to [54501], [54630].

See #56796, #56835.
Built from https://develop.svn.wordpress.org/trunk@54631


git-svn-id: http://core.svn.wordpress.org/trunk@54183 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.1-RC1-54630';
+$wp_version = '6.1-RC1-54631';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.