Fix Task Icon menu behavior.

Tapping task icon will now show the scrim for rest of thumbnail and not snap to page that is already snapped to.
Pressing task icon from clear all will scroll to the page.
Link: https://drive.google.com/file/d/1I90rd6ELPZNIje2_VZ3CamWWeFN8ywhL/view?usp=sharing

Bug: 158004853
Change-Id: I9ac8229a603190ea09a74e1cfb70a6bb6e1e65b7