[patch] Adjustments to Notification Area's Preferences window

[onox]

Removes the icon size scale and the extra offset spinbutton and sets the icon of the dialog window to "notification-area", which is the applet's icon. This patch should be applied when an ideal world is reached where most application's systray icon display correctly.

Based on lp:awn-extras revision 1507 (2011-02-16)