libsysprof: wait until first queue_reload() to load

We might need to query the server, so this ensures that we don't authenticate
the polkit session until needed.

src/libsysprof/sysprof-process-model.c

@@ -67,8 +67,6 @@ static void
 sysprof_process_model_init (SysprofProcessModel *self)
 {
   self->items = g_ptr_array_new_with_free_func (g_object_unref);
-
-  sysprof_process_model_queue_reload (self);
 }
 
 static guint