Filter our services in the application slice which don't match the app string specifier

An upcoming systemd change puts all services in the app slice by default. We don't
necessarily want to list all of these as applications.

processcore/application_data_model.cpp

@@ -37,5 +37,5 @@ bool ApplicationDataModel::filterAcceptsCGroup(const QString &id)
     // this class is all temporary. In the future as per https://systemd.io/DESKTOP_ENVIRONMENTS/
     // all apps will have a managed by a drop-in that puts apps in the app.slice
     // when this happens adjust the root above and drop this filterAcceptsCGroup line
-   return id.contains(QLatin1String("/app")) || (id.contains(QLatin1String("/flatpak")) && id.endsWith(QLatin1String("scope")));
+   return id.contains(QLatin1String("/app-")) || (id.contains(QLatin1String("/flatpak")) && id.endsWith(QLatin1String("scope")));
 }