v.io/wspr/veyron/services/wsprd/app: use "error" instead of verror2.E

This is a companion CL to
	https://vanadium-review.googlesource.com/#/c/2962/2
which is reducing the use of verror2.E as an interface with an eye to using a
struct soon.  That companion CL makes operations available as functions on "error"
rather than methods on verror2.E.

Change-Id: I0ea9cc2a461cafacbda52bb7b7938db6a11af120
1 file changed
tree: 4480ba1eb0f2d965025b9af9248bb28f58cf4660
  1. services/