NDF [Minor] TestRenterPricesVolatility

MERGE REQUEST

MR Guidelines

Overview

Fixes the TestRenterPricesVolatility NDF by moving the test from the legacy test package to the satest package.

Proof: https://gitlab.com/NebulousLabs/Sia/-/jobs/625154127

Checklist

Review and complete the checklist to ensure that the MR is complete before assigned to an approver.

• All new methods or updated methods have clear docstrings
• Testing added or updated for new methods
• Any new packages are added to Makefile and .gitlab-ci.yml
• API documentation updated for API updates
• Module README.md updated for changes to workflow
• Issue added to Sia-UI repo for new supporting features
• Changelog File Created