Remove useless 'debug' toplevel attribute.

9 jobs for master in 1 minute and 19 seconds
Name Stage Failure
testListen Test
Info: argo_nodeos_config successfully cleaned the container config.
[ daemon , cmd run , cmd listen (-v) ]
Info: Processes cancelled due to termination of: cmd run with exit information: Right (ExitSuccess,Clean,Clean)
Error: cmd run died before a message could be found with error code ExitSuccess

note: keeping build directory '/tmp/nix-build-testEnv.drv-5'
builder for '/nix/store/by0yda45bpfnnmb20ss62jk56y0kjil5-testEnv.drv' failed with exit code 1
error: build of '/nix/store/by0yda45bpfnnmb20ss62jk56y0kjil5-testEnv.drv' failed
ERROR: Job failed: exit status 1