Reland: Clear Bitmap density to render correctly in Overview

This reverts commit 504e10d9.

Reason for revert: Attempting to reland
Fix: 419196782
Flag: com.android.launcher3.enable_refactor_task_thumbnail
Test: Manual - steps in bug
Test: Manual - Media projection (other usage of the screenshots)
Test: Manual reverify of b/421205443

Change-Id: I0b34f3e29e74cf2a257a8e7da42f0ac14be75bae