Lower owncloud "Sync Activity" message urgency

dotfiles.config/dunst/dunstrc

 # NOTE: It might be helpful to run dunst -print in a terminal in order to find
 # fitting options for rules.
 
+[oc-sync-spam]
+    appname = owncloud
+    summary = "Sync Activity"
+    urgency = low
+    timeout = 5
+
 #[espeak]
 #    summary = "*"
 #    script = dunst_espeak.sh