Latest release has a __MACOSX directory in zip file

[micaherne]

The zip file of the latest release downloadable from the Moodle plugin directory (2023122500) has a __MACOSX directory at top level in addition to the hvp directory.

This causes issues with Moodle, in particular with the unit test component_test::test_get_plugin_list, which fails.

[abautu]

It also breaks composer (I use composer to manage Moodle dependencies). Due to the __MACOSX directory, the plugin is installed into moodle/mod/hvp/hvp/ (instead of moodle/mod/hvp/).

[mackensen]

I also use composer to manage my Moodle installation and this issue makes this version of the plugin uninstallable. Same issue as #531.