No need to print SATURNIN_LIBEXEC in debug

The related functionality is stable already and the path is easy to find
out using package manager.

src/saturnin.sh

@@ -224,7 +224,7 @@ saturnin__main() {
         *)              break;                      ;;
     esac done
     subcommand="$1"; shift
-    debug -v SATURNIN_APP_VERSION SATURNIN_LIBEXEC SATURNIN_CONF_PATH
+    debug -v SATURNIN_APP_VERSION SATURNIN_CONF_PATH
     case "$subcommand" in
         conf)    saturnin__conf "$@"                ;;
         _ls_sc)  saturnin__lssc                     ;;