fix: remove deprecated FEATURE_GROUPMEMBERSONLY from zoom_supports()

[michael-hughes-strath]

Summary

Removes case FEATURE_GROUPMEMBERSONLY: from zoom_supports() in lib.php.

Fixes #714

Problem

The FEATURE_GROUPMEMBERSONLY constant has been deprecated in Moodle 5.3 (MDL-83231). In Moodle 5.3+, the upgrade process throws a plugin_defective_exception if a module's _supports() function returns true for 'groupmembersonly', rendering the plugin broken and blocking upgrades.

Change

One line removed from zoom_supports() in lib.php:

-        case FEATURE_GROUPMEMBERSONLY:

Note: FEATURE_GROUPINGS is not deprecated and is unchanged.

Moodle versions affected

Moodle 5.3+ (main branch)

[michael-hughes-strath]

I was going to do a more robust version that checks the moodle branch value (>=503) but it actually turns out that FEATURE_GROUPMEMBERSONLY has asctually been deprecated since Moodle 2.8!

[smbader]

Michael,

Thank you for such a well written and explained issue/pull request. FEATURE_GROUPMEMBERSONLY seems to have been just hanging around quietly for a 11 years. Also, thanks for bringing this to our attention before release!

Much appreciated!
Steve