Bug 16451: Fix missisng body id in orders_by_budget.tt

Bug 16451: Fix missisng body id in orders_by_budget.tt

Bug 11371 introduced a new template, which fails the xt/tt_valid.t tests.

To test:
- On master, run:
  $ prove xt/tt_valid.t
=> FAIL: Tests fail on orders_by_budget.tt
- Apply the patch
- Run
  $ prove xt/tt_valid.t
=> SUCCESS: Tests don't fail on orders_by_budget.tt
- Sign off

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>