Applet notification improvement

[gabdub]

Why? because the notification applet is implemented using a menu to show the icons and that menu uses the same theme settings as a regular (text) menu.

Check this topic to see a way to correct this:

Mate 18.04 - Indicator Applet Complete 1.20.0 - Icons resize issue

I use Ubuntu Mate on several PC and updating to Mate 18.04 bring me an annoying permanent issue. Just to note, I prefer to use Menu Bar, Font, and an desktop element size small, to not waste space used for displaying main apps content. Par example I use on all PC even one with 4K display size on menu bar between 17 and 20 pixels, but on all of this PC the Indicator Applet Complete will not display correctly. it has an padding effect of 2-3pixel on both border edges, witch other icons like C…