Repair Vandelay async startup data retrieval

Increment the number of items retrieved at startup to ensure the UI
waits for all async requests to return before continuing with page
rendering.

The counter should have been updated with this commit, which adds bucket
retrieval to the startup sequence.

59cc4b9524bfcf9a56f54c5ed5a3d56a7d1b86e6

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Ben Shum <bshum@biblio.org>