Use proper size for indexing

We are indexing over mRecords, so use its size to determine index limit
in the layouts used in QuickQSPanel

The issue is introduced in the refactor of QS as the tiles are now set
in QSPanelControllerBase#switchTileLayout, after the switch is
completed.

Test: manual, dismiss media while in landscape
Fixes: 171628022
Change-Id: I5f0caf73f7637ea8308d8795b0a60825025d6c5b