Fix contract abi deletion #392
Description
In https://github.com/oceanprotocol/barge/blob/feature/nodes/start_ocean.sh#L119, we are deleting the old artifacts. But v4 has a lot of folders and subfolders, so this needs to be updated
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In https://github.com/oceanprotocol/barge/blob/feature/nodes/start_ocean.sh#L119, we are deleting the old artifacts. But v4 has a lot of folders and subfolders, so this needs to be updated