pkg/internal/builtintest: don't print superfluous newlines
The additional newline from Fprintln meant the test expected two
newlines rather than just one, which is incorrect.
Change-Id: I6da82454f0f4d331cf40f953ed52f62164ddcb7b
Signed-off-by: Thomas Way <thomas@6f.io>
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1171356
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
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