A setting changed through mesh-controller.settings rewrote dunstrc, but the
running dunst kept the old font and width until the next login. Declare the
package's dunst.service in the account's manager, without a state, with
reload-on the configuration, so the node-engine runs its ExecReload
(dunstctl reload) and what is on screen stays. Add dunst_reload to do the
same on demand and say the font and width the files set.
