go.tools/dashboard/app: fix integration tests

They had been broken after a few recent changes.

LGTM=bradfitz
R=bradfitz
CC=golang-codereviews
https://golang.org/cl/152150043
1 file changed
tree: b96915204bec6f53888b7d7e3750549f57635b38
  1. app/
  2. builder/
  3. coordinator/
  4. env/
  5. updater/
  6. README