Make sure fixtures have empty `post_content` in search test.

The generator sequence was causing false positives when the search terms
('1' and '0') happened to match the current sequence number (eg,
'Post content 190').

Introduced in [36278].

See #31025.

git-svn-id: https://develop.svn.wordpress.org/trunk@36520 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/query/search.php

@@ -145,11 +145,13 @@ class Tests_Query_Search extends WP_UnitTestCase {
 		$p1 = $this->factory->post->create( array(
 			'post_status' => 'publish',
 			'post_title' => '1',
+			'post_content' => '',
 		) );
 
 		$p2 = $this->factory->post->create( array(
 			'post_status' => 'publish',
 			'post_title' => '0',
+			'post_content' => '',
 		) );
 
 		$q = new WP_Query( array(