Fix Issue #1848: Medley script (and hence loadup script) now checks for lde (ldeinit) on PATH (#2129)

In medley script(s), when executing maiko (lde or ldeinit) check if its on the PATH before looking for it in MEDLEYDIR/maiko or MEDLEYDIR/../maiko.

scripts/medley/medley_args.sh

@@ -341,7 +341,7 @@ do
         ;;
       --maikodir)
         # for use in loadups
-        if [ "$2" = "-" ] || [ "$2" == "--" ]
+        if [ "$2" = "-" ] || [ "$2" = "--" ]
         then
           maikodir_arg=""
           maikodir_stage=""