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Use deep shortcuts' icons as a fallback when updating
We already do this when loading, but now we also do it when getting callbacks that potentially change the shortcut icon. These callbacks first check the pinned shortcut info, but if there is no icon there we now fall back to the current icon instead of the default icon. Bug: 62814533 Change-Id: I777adedf4b7f93dbaddb98a993eda34d59dcc173