Fix get_object_vars() for non-hooked props in hooked prop iter

The zend_hash_update_ind() variant unwraps indirects, rather than creating them.
Don't use _zend_hash_append_ind() because

Fix get_object_vars() for non-hooked props in hooked prop iter

The zend_hash_update_ind() variant unwraps indirects, rather than creating them.
Don't use _zend_hash_append_ind() because the property might already exist.

Fixes GH-16725
Closes GH-16805

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