Shorten the error message passive notification

The default timeout is a bit long, "short" is 3 seconds shorter than the
default. For  long-term network errors, we have a banner telling you so
anyway. This should hopefully reduce the notification spam when you have
temporary network dropouts.

src/qml/Main.qml

@@ -249,7 +249,7 @@ Kirigami.ApplicationWindow {
         target: Controller
 
         function onErrorOccured(error, detail) {
-            showPassiveNotification(detail.length > 0 ? i18n("%1: %2", error, detail) : error);
+            showPassiveNotification(detail.length > 0 ? i18n("%1: %2", error, detail) : error, "short");
         }
     }