TinyMCE: update the tests for version 4.5.6. Remove default plugins t…

…ests, it is quite pointless to keep repeating them at this point.

See #40305.

Built from https://develop.svn.wordpress.org/trunk@40399


git-svn-id: http://core.svn.wordpress.org/trunk@40306 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-alpha-40398';
+$wp_version = '4.8-alpha-40399';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.