Following f4fbaf1efa
which changes the label/checkbox structure into:
```
<div class="custom-control custom-checkbox">
<input type="checkbox" class="custom-control-input" id="customCheck1">
<label class="custom-control-label" for="customCheck1">...</label>
</div>
```
So, before this commit, there may have been multiple input with the same Id.
The consequence is that, when clicking on a label, the browser would take the first Id it found
which was erroneous, because all checkboxes in Favorites menu had the same Id
In reality, the use case goes as:
- open a x2m,
- search more
- Favorites > Save current search
> click on one the two checkboxes
> The dropdown closed, without checking the box
After this commit, when clicking on the checkbox in the favorites menu
the checkbox is toggled and the dropdown stays. Also, the checkboxed have now unique ids
OPW 1974587
closesodoo/odoo#33032
Signed-off-by: Lucas Perais (lpe) <lpe@odoo.com>