internal/_e2e: fix end to end tests to set source
The end-to-end tests had not been updated to
set the now-mandatory source field.
Signed-off-by: Roger Peppe <rogpeppe@gmail.com>
Change-Id: Ibc63df5a90f5a4c5f191a5f4c7f8a9a335ed76ff
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1193382
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>