Revert "[Launcher3] Hide keyboard when fastscroller scrolling down and keyboard"

This reverts commit 883a79db715258e92b738357771078548920df65.

Reason for revert: Revert this change because it caused other bug b/343285163

Change-Id: I1fdb21cc4a5cdcf2c22e9b1927753b290626289c
1 file changed