Scoru,Proto: do not use tag "kind" in [Sc_rollup_originate] encoding

Context

The operation's encoding already use the tag "kind" for the operation name. So before this commit, the tag is duplicated for the operation name and the pvm name.

Manually testing the MR

You can go check the encoding using tezos-codec dump encodings before and after the merge request for this operation.

Checklist

• n/a Document the interface of any function added or modified (see the coding guidelines)
• n/a Document any change to the user interface, including configuration parameters (see node configuration)
• n/a Provide automatic testing (see the testing guide).
• n/a For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR