What

Add a new test where a refutation game is played on an invalid reveal DAL parameters.

Why

We are going to modify this case in the refutation game and it's not tested at all.

I hacked a bit the existing loser mode of the rollup node to support this case.

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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).
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