Tests: Use wp_recursive_ksort() in WP_Theme_JSON_Resolver tests.

This replaces a helper method in `Tests_Theme_wpThemeJsonResolver` with the `wp_recursive_ksort()` function that was introduced later for the same purpose.

Follow-up to [52049], [53129], [55117].

See #56793.

git-svn-id: https://develop.svn.wordpress.org/trunk@55118 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/theme/wpThemeJsonResolver.php

@@ -472,18 +472,6 @@ public function test_add_theme_supports_are_loaded_for_themes_without_theme_json
 		$this->assertTrue( $settings['border']['color'], 'Support for appearance-tools was not added.' );
 	}
 
-	/**
-	 * Recursively applies ksort to an array.
-	 */
-	private static function recursive_ksort( &$array ) {
-		foreach ( $array as &$value ) {
-			if ( is_array( $value ) ) {
-				self::recursive_ksort( $value );
-			}
-		}
-		ksort( $array );
-	}
-
 	/**
 	 * @ticket 54336
 	 * @ticket 56611
@@ -582,8 +570,8 @@ public function test_merges_child_theme_json_into_parent_theme_json() {
 				),
 			),
 		);
-		self::recursive_ksort( $actual_settings );
-		self::recursive_ksort( $expected_settings );
+		wp_recursive_ksort( $actual_settings );
+		wp_recursive_ksort( $expected_settings );
 
 		// Should merge settings.
 		$this->assertSame(