Fix unconditional main call causing --help to run training

Removed unconditional 'main' call after case statement.
The case statement already handles the empty string case
by calling main, so the extra call was causing all
command-line arguments to be ignored and training to run.

scripts/training/master_training_launcher.sh

@@ -1026,5 +1026,3 @@ case "${1:-}" in
             exit 1
             ;;
     esac
-
-main