[FIX] Web: ListView and ListView.Groups: pagers
[FIX] Web: ListView and ListView.Groups: pagers

* Fixes the pager on grouped list views for which there was no
  specific behavior (except of doing +1 or -1) for next and previous
  actions on last and first pages respectively.
* Hides the previous and next buttons of the main pager on grouped list
  views as these buttons have no effect in grouped mode.

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