bump web
bump web

Submodule src/github.com/concourse/web 498274a5..807baa96:
  > Remove duplicate test in watsjs

Signed-off-by: Mark Huang <222d07b3281cbd31b38f93d23c330586c713e995@pivotal.io>

concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse