Taxonomy_menu'ed term's menu item loses hierarchy when term is edited in TaxMan

When editing and saving a child term (e.g it's name or some field) via Taxonomy Manager, and the term is in a vocabulary that's synced into a menu via the taxonomy_menu.module, that term's menu item is thrown out its hierarchy onto the top level of the synced menu.

Similar problems have been long reported in the issue queues of both modules for different versions, such as:

* https://www.drupal.org/node/742660 →
* https://www.drupal.org/node/837954 →
* https://www.drupal.org/node/980716 →

The problem still seems to exist, and the reason is that taxonomy_manager_term_data_form_submit() structures the parents information for that edited term in a way ($term->parents with fancy substructures) that's incompatible to how taxonomy prepares the parent information of its edited/saved terms (i.e. $term->parent (without an 's') as a simple array of tids) and to what taxonomy_menu expects structure-wise ($parents as a simple array of tids). Phew, what a mess.

The simple patch below against taxonomy_manager_7.x-1.0 should fix that particular problem.

Please test and give feedback, or commit if tested.