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Don't clear notifications when refetching

Authored by Mooeypoo.

Description

Don't clear notifications when refetching

Make the popup header the pending element to give the user a visual
indication that the notification widget is being updated, but don't
clear the notifications before loading more from the database.

Bug: T112186
Change-Id: If2b724fab07ef5b7caf5cab3e44fe326470ac0e7