search: Clear progress before results

[kazarmy]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository.
• I made sure to follow the project's coding style.
• I've documented every RZ_API function and struct this PR changes.
• I've added tests that prove my changes are effective (required for changes to RZ_API).
• I've updated the Rizin book with the relevant information (if needed).

Detailed description

The search progress notification is of significant length, so if the first result line is short, then there will be an unwanted tail, e.g.

due to use of just \r. This pr clears the last progress notification before printing the results so the above will not happen. It also sleeps first before printing search progress, rather than the other way around, to prevent unnecessary flicker.

Test plan

All builds are green. Test may be racy, but hopefully CI computers are fast enough.

Closing issues

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