Tx rollup use ticket balance key instead of own hash ticket wrapper

Context

The Tx_rollup.hash_ticket from alpha_context.ml does not output the same result as ticket_balance_key.ticket_balance_key because the owner field was not same the same way.

Here I propose to reduce the possibility of different hash values by splitting ticket_balance_key into two functions, one using typed content and the other one only Script.node value.

Manually testing the MR

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• 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.
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