[BUGFIX] WS preview shows pages changes from all WS

In workspace preview the query condition for pages records has to be
enhanced to restrict to live WS and current WS.

Change-Id: Ib271b9bb435b50f2777621707728a74ba5de4187
Fixes: #37209
Releases: 6.2, 6.1, 6.0
Reviewed-on: https://review.typo3.org/24574
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring