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Also update icon for assistant server notifications.

Bug: b/111936939
Test: Manual Test
Change-Id: I91d013daba51174d9532b6806484f1ed42809f14
Reviewed-on: https://chromium-review.googlesource.com/1162976
Commit-Queue: Yue Li <updowndota@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581007}