cmd/cue: fix up fmt_multi comparison
I suspect that out/star-cue was meant to be a check for star.cue,
not x.cue, which already had out/x.cue.
Signed-off-by: Daniel Martí <mvdan@mvdan.cc>
Change-Id: Iefa68fae3bea616f53ce0639b2f090ff6c44f0d6
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/557333
Reviewed-by: Paul Jolly <paul@myitcv.io>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>