holding space: Change Tote previews default value

This is based on the kHoldingSpacePredictability experiment flag

Bug: 1354520
Change-Id: Ie1dbf26e488ca26bb7b00edd28518f50237f4d53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3841852


Reviewed-by: David Black <dmblack@google.com>
Auto-Submit: Sam Cackett <samcackett@google.com>
Commit-Queue: Sam Cackett <samcackett@google.com>
Cr-Commit-Position: refs/heads/main@{#1039177}