Fixing the loader to bind the first screen as well as the hotseat together

When the loader ran for the first time (or when called due to force-reload),
it was binding with page = -1 (invalid pageId is -1001). This was causing loader
to assume the workspace to be on a valid screen, and causing the loader to
only bind the hotseat first.

Bug: 27705838
Change-Id: Ia8eb2543d8cee1268256b2d6bccf33828937c54a