Ignore unreachable block on `sel cleararea` operation

## What do you need help with?
How can I make Baritone ignore a block if it's unreachable on a `sel cleararea` operation?

I've noticed it'll get stuck in a position, unable to reach the block, and softlock the goal. I'd prefer it leaves a couple blocks unmined if that means it'll keep working, and not just pause the entire operation.

## Final checklist
- [x] I know how to properly use check boxes
- [X] I have not used any OwO's or UwU's in this issue.