Context

When using

evm-evaluation-assessor -h

The file was written over but not truncated.
This PR fixes this issue.

Manually testing the MR

Run

evm-evaluation-assessor

Add some lines at the end.
Rerun

evm-evaluation-assessor -h

And check that the lines you added are not here anymore.

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.
Select as Assignee the next person who should take action on that MR