Currently, the g_bus_own_name_on_connection function is called for the
org.freedesktop.FileManager1 name before exporting the
/org/freedesktop/FileManager1 skeleton. This seemingly works fine in most
cases, but occasionally the name is acquired too early and D-Bus clients
can get No such interface error. This is regression caused by the commit
2293e813. Let's try to own the nam until
after exporting the skeleton to avoid this error.