[Bug 62064] Cancel button icons are not themed

[Bernat Tallaferro]

Public bug reported:

The icon on the "Cancel" button of any dialog does not have a "Human"
icon, and the default GNOME cross icon is used instead.

It would be nice to have some consistency here, since normally the other
buttons next to "Cancel" are themed (e.g. the "Apply" button, see
screenshot)

** Affects: human-icon-theme (Ubuntu)
     Importance: Untriaged
         Status: Unconfirmed

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Cancel button icons are not themed
https://launchpad.net/bugs/62064