[lumo] Update SVG icons to use 24 canvas instead of 1000

[web-padawan]

From #1989 (comment)

The icons are drawn on a 24x24 canvas, so that seems like the correct value instead of this. These type of values have been used in the icon font, though, to set the baseline of the icons.

Changing this requires that the coordinates in the SVG paths are adjusted as well.