Fix for "change icon" in KEditToolbar

[David Faure]

As George noticed, the ability to associate an icon with an action in "Configure Toolbars"
was broken - the icon would change in the dialog, but not in the actual toolbar.

Basically the code was modifying a *copy* of the XmlData struct, instead of the
struct itself... at saving time nothing happened of course.

Patch attached - OK for backport?

-- 
David Faure, faure at kde.org, sponsored by Trolltech to work on KDE,
Konqueror (http://www.konqueror.org), and KOffice (http://www.koffice.org).
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