Block Editor: Obey the `AUTOSAVE_INTERVAL` constant.

Props youknowriad.
Fixes #45262.


Built from https://develop.svn.wordpress.org/trunk@44504


git-svn-id: http://core.svn.wordpress.org/trunk@44335 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/edit-form-blocks.php

@@ -273,7 +273,7 @@ $editor_settings = array(
 	'titlePlaceholder'       => apply_filters( 'enter_title_here', __( 'Add title' ), $post ),
 	'bodyPlaceholder'        => $body_placeholder,
 	'isRTL'                  => is_rtl(),
-	'autosaveInterval'       => 10,
+	'autosaveInterval'       => AUTOSAVE_INTERVAL,
 	'maxUploadFileSize'      => $max_upload_size,
 	'allowedMimeTypes'       => get_allowed_mime_types(),
 	'styles'                 => $styles,

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-alpha-44503';
+$wp_version = '5.1-alpha-44504';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.