Dismiss all task ids from TaskView

In recents we were hardcoding that only two task ids can be dismissed
when dismissing a TaskView. Update the logic to dismiss arbitrary
number of task ids that are returned from TaskView.

Fixes task dismissal logic for desktop where there can be more than 2
tasks represented by one taskview.

Flag: not needed, trivial change
Bug: 280830106
Test: Add chrome, files and calculator to desktop. Dismiss the desktop
  tile with 3 apps from overview. Open youtube and move it to desktop.
  Observe that desktop only contains youtube. None of the 3 previous
  apps are added back.
Test: Move 2 apps to split screen, dismiss the split tile from overview.
  Observe both apps are dismissed.
Test: Dismiss a single app from overview.
Change-Id: I139943f5d678d63f449116de26debae9be122b21