Don't output the filename in dockerfile-lint.

dockerfile_lint shows the filename clearly, there's no need to output
the filename again (it shows up at the end of the output, very
confusing).

dockerfile-lint

 #!/bin/sh
 set -eu
 
-echo "$@" | xargs -rtn1 dockerfile_lint --dockerfile
+echo "$@" | xargs -rn1 dockerfile_lint --dockerfile