do not use fake wordpress version

Wordpress APIs use the Wordpress version in the user-agent to determine which
plugins are available for an update. Using a fake version breaks this
mechanism.

Signed-off-by: shammash <shammash@autistici.org>

wp-includes/update.php

@@ -156,11 +156,7 @@ function wp_version_check( $extra_stats = array(), $force_check = false ) {
 	$options = array(
         'timeout' => $doing_cron ? 30 : 3,
 		'user-agent' => 'WordPress/' . $wp_version . ';  http://wordpress.org',
-		'headers' => array(
-			'wp_install' => home_url( '/' ),
-			'wp_blog' => home_url( '/' )
-		),
-		'body'       => $post_body,
+		'body' => $post_body,
 	);
 
 	$response = wp_remote_post( $url, $options );