If you've reversed all the locking, then surely you have app manager unlocked? Which means you can just press on the app manager icon, and uninstall it that way? (If you're uninstalling App Locker, you should make sure you unhide everything first anyway, because it won't unhide itself. And once you've done that, app manager should be available.)

But if you're sure you know what you're doing, the command is just "hildon-application-manager". For me it launches it without problems. It does print some error messages in the X-Term about finding some images, but other than that it's fine.