oak-run console lc rmdata command uses second parameter for index path (and defaults to /oak:index/lucene)

rmdata command currently takes 2 arguments where 1st one isn't even used - the second one is represents the index to be deleted.

Worse yet, the command assumes a default index to be deleted to be /oak:index/lucene - that can lead to unintentional deletion.

Destructive functionality, imo, shouldn't have default value for things to be deleted. Also, of course, we should fix that only 1 parameter is expected and parsed.