Indices correction inside RecentsView

Audit all the functions inside RecentsView with the TaskView index as
a parameter. Make sure the AddDesktopButton is considered while
setting the value of these parameters.

Flag: EXEMPT refactor
Bug: 379942019
Test: m
      alt+tab to the "# more apps" button insde KQS view, the first
      hidden TaskView inside the RecentsView will be focused.
Change-Id: I92cd3e38700e83e72d362dc47d3adae538695b60