Posts, Post Types: Increment `post_count` option value during blog creation.

Previously, the `post_count` option value was not incremented when the default "Hello world!" post is inserted during blog creation on a multisite installation.

Props henry.wright.
Fixes #54462.
See #53443.

Built from https://develop.svn.wordpress.org/trunk@52201


git-svn-id: http://core.svn.wordpress.org/trunk@51793 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/upgrade.php

@@ -249,6 +249,9 @@ if ( ! function_exists( 'wp_install_defaults' ) ) :
 				'post_content_filtered' => '',
 			)
 		);
+
+		update_option( 'post_count', 1 );
+
 		$wpdb->insert(
 			$wpdb->term_relationships,
 			array(

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-52200';
+$wp_version = '5.9-alpha-52201';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.