Docs: Fix incorrect property doc in WP_Theme::get_allowed() tests.

The `@array` tag does not exist. This should be `@var array`.

Reference: [https://developer.wordpress.org/coding-standards/inline-documentation-standards/php/#2-1-class-members PHP Documentation Standards: Class Members].

Follow-up to [36350].

Props jrf.
See #59651.

git-svn-id: https://develop.svn.wordpress.org/trunk@57107 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/theme/wpThemeGetAllowedFilters.php

@@ -8,7 +8,7 @@
 	 */
 	class Tests_Theme_wpThemeGetAllowedFilters extends WP_UnitTestCase {
 		/**
-		 * @array List of themes allowed before filters are applied.
+		 * @var array List of themes allowed before filters are applied.
 		 */
 		protected $default_allowed;