MDL-83268 core_h5p: Remove the h5plib_v126 plugin

The h5plib_v126 plugin can be removed because it has been replaced
with h5plib_v127, which is using the latest versions of the
libraries.

lib/classes/plugin_manager.php

@@ -1727,7 +1727,7 @@ class core_plugin_manager {
             'editor' => array('tinymce'),
             'enrol' => array('authorize'),
             'filter' => array('censor'),
-            'h5plib' => array('v124'),
+            'h5plib' => array('v124', 'v126'),
             'media' => array('swf'),
             'portfolio' => array('picasa', 'boxnet'),
             'qformat' => array('blackboard', 'learnwise', 'examview', 'webct'),
@@ -1908,7 +1908,7 @@ class core_plugin_manager {
             ),
 
             'h5plib' => array(
-                'v126',
+                'v127',
             ),
 
             'local' => array(