Convert search tests to use ::$modules property instead of parent::setUp($modules)

[lorentz:search | Fri 11:04:38] $  grep -nr "parent::setUp([^)]" *
lib/Drupal/search/Tests/SearchBlockTest.php:20:    parent::setUp(array('block'));
lib/Drupal/search/Tests/SearchCommentCountToggleTest.php:36:    parent::setUp(array('comment'));
lib/Drupal/search/Tests/SearchCommentTest.php:27:    parent::setUp(array('comment'));
lib/Drupal/search/Tests/SearchConfigSettingsFormTest.php:26:    parent::setUp(array('block', 'search_extra_type'));
lib/Drupal/search/Tests/SearchEmbedFormTest.php:33:    parent::setUp(array('search_embedded_form'));
lib/Drupal/search/Tests/SearchKeywordsConditionsTest.php:23:    parent::setUp(array('comment', 'search_extra_type'));
lib/Drupal/search/Tests/SearchLanguageTest.php:23:    parent::setUp(array('language'));
lib/Drupal/search/Tests/SearchNodeAccessTest.php:25:    parent::setUp(array('node_access_test'));
lib/Drupal/search/Tests/SearchPageOverrideTest.php:25:    parent::setUp(array('search_extra_type'));
lib/Drupal/search/Tests/SearchRankingTest.php:20:    parent::setUp(array('statistics', 'comment'));
lib/Drupal/search/Tests/SearchTestBase.php:21:    parent::setUp($modules);