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Also remove the file test check. GLib recommends just trying to use
a file instead of checking if it exists first. The old code had a
check because it was the only way I could think of to override
the fallback missing image icon of GFileIcon.

This is updated when there are changes in the user's profile in this
service.

Finally, round all the images, which is probably not the most desired
option for everyone, but it is what most user administrators use.