[Bug 33002] logout dialog UI regression -- please revert

[Martijn van de Streek]

Public bug report changed:
https://launchpad.net/malone/bugs/33002

Comment:
The dialog made it into dapper as part of a design that was made at UBZ
(there wasn't a good/clear shutdown dialog in breezy -- we set out to
design a better one)

Apparently, the GNOME upstream people decided this _at the same time_ as
us, and implemented dialogs that are more HIG-compliant and overall
nicer looking.