Split tasks in RTL mode

For `translationX` in RTL (right to left layout) mode we should take into account `secondarySnapshotWidth`, not the primary one.

The same for `translationY` for foldable phone in folded mode

Known issue: there is still a wrong position for overview app icon, but it is not related to the task thumbnail, and will be fixed in a dedicated task
(Screenshot of the issue: https://screenshot.googleplex.com/9GHNWxQ5H6vJPn5)
Known issue task: b/315787393

Bug: 309452423
Flag: NONE
Test: manual

Tablet: https://drive.google.com/file/d/1WGUVcFq0sFTJYsAwcjE6E1SHMRe7_TaV/view?usp=sharing
Foldable phone: https://drive.google.com/file/d/1GvDgYg8R9OEoMSDKZaZVXSlsxh_qS-wW/view?usp=sharing

Change-Id: Iefe7fec586592e6a72c0f3be5933307213d92c7f