[BUGFIX] Paginator in TER list not using ajax

The paginator in the extension list from TER is transformed into
using Ajax. This fails because this process searches for links inside
a class which is used by the frontend paginator widget. Changing it to
the id of the backend paginator widget makes the ajax calls work again.

Resolves: #56184
Releases: 6.2, 6.1, 6.0
Change-Id: I06c193b2657eb3edae623dc0126b06c240f486c6
Reviewed-on: https://review.typo3.org/27851
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters