gEDA-dev: [pcb] an unnecessary lines in ps hid

[DJ Delorie]

> In src/hid/ps/ps.c, is the hid_expose_callbacks in line 285 really needed
> when the same call is done later, in line 291 anyway?

The first time it's called, we're generating the table of contents.
We don't actually *draw* any of the layers, we just want the core to
tell us which ones would be requested.

The second time through, we're drawing pages 2 through N.