MDL-78087 h5p: Fix TimeLine display bug

When the H5P third-party library was upgraded to moodle-1.23, the calls to
libraryToString(xxx, true) where replaced with libraryToFolderName().
We missed this, which was doing the H5P Timeline activities weren't
displayed properly.

Thanks Joseph for raising this and preparing a patch! Well done!

Co-authored: Joseph Rézeau

h5p/classes/core.php

@@ -89,7 +89,7 @@ class core extends H5PCore {
                 'core_h5p',
                 'libraries',
                 $library->id,
-                "/" . self::libraryToString($dependency, true),
+                "/" . self::libraryToFolderName($dependency),
                 ''
             ))->out(false);
         }