Fix column sorting/labels of nuxeo-data-table with multiple sorts applied

Steps to reproduce:

1. In Web UI, open a collection (Folder/Workspace) containing several Documents, such that nuxeo-data-table contains several rows.
2. Set multiple sorts in the table by clicking on the header arrows in succession (at least three).
3. Remove the second sorting column (arrow with label '2') - observe that columns "1" and "3" remains the same.
4. Click the sort on column "1" several times in succession to remove and reapply the sort - observe that this column is now labelled "3", and the former is now "2" (the label "1" will not appear until refreshing the page and reapplying sorts)

Expected result: When removing the sorting on a column, the remaining sort labels update according to the amount of sorting columns remaining, and the sorting of records is updated to match.
Actual result: On initial removal of a sorting that is not the last, the remaining sort labels remain static until a new sort is applied; after which, the sorting numbers displayed are incorrect until page refresh.

Attaching image references of a test case using a three-column table with sorts applied using each column.