Deal with multiple vocabularies

I applied this issue's patch to version 2.0.x of the project. Only one location needed a small adjustment.

tgauges → changed the visibility of the branch 2960456-2.0.1-deal-with-multiple to hidden.

tgauges → closed merge request !35

Hello,

Patch #7 does not apply on version 2.0.2 of term_reference_tree.

Here are some minor changes to make it work.

Added functionnalities tested with :
- drupal/core 11.2.3
- drupal/term_reference_tree 2.0.2
- php 8.4