Build/Test Tools: Fix and standardise calls to the tearDown() method in the test suite.

The parent method should be called after any test-specific teardown.

See #52625


git-svn-id: https://develop.svn.wordpress.org/trunk@50450 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/rest-api/rest-controller.php

@@ -53,10 +53,10 @@ class WP_Test_REST_Controller extends WP_Test_REST_TestCase {
 	}
 
 	public function tearDown() {
-		parent::tearDown();
-
 		global $wp_rest_additional_fields;
 		$wp_rest_additional_fields = array();
+
+		parent::tearDown();
 	}
 
 	public function test_validate_schema_type_integer() {