internal/cuetxtar: fix @test(debugOutput) multiline string format
CUE multiline strings require a newline immediately after the opening
""". The generated @test(debugOutput, """...""") was missing this,
causing parse errors when the file was later loaded as CUE source.
Signed-off-by: Marcel van Lohuizen <mpvl@gmail.com>
Change-Id: Ib3e3fdd3d94126e679b77f7b98cddeff91a68c6d
Reviewed-on: https://cue.gerrithub.io/c/cue-lang/cue/+/1234944
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>