[Bug 46401] update notification icon is a label

[Étienne Bersac]

Public bug reported:

Hello,

The update notification icon in the notification area is an orange
label. It must be an icon consistent with orther icons on the panel such
as shutdown icon.

Étienne.

** Affects: ubuntu-artwork (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

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update notification icon is a label
https://launchpad.net/bugs/46401