DO NOT MERGE: Revert "Force FGS notifications to show for a minimum time"

This reverts commit 09843a68.

Reason for revert: There is possible reentrant behavior when posting the safeToRemove callback after a FGS has been canceled/reposted

Bug: 140948482
Change-Id: I2c5b9135e57a87f412dce8c167147dcb38f6bbae
(cherry picked from commit 7c6df8da)