Do not cause a explosion when updating gnome-software on a mutable system

We only need to do the notification once, rather than wildcard refining the
org.gnome.Software GsApp for each inotify event.
1 job for <span class="ref-name">wip/hughsie/runtime-update</span> in 13 minutes and 17 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #230807
build-gnome-software

00:13:17