Updated tolerances on Perf test

Issue/feature addressed

CubeAllElements ADRSolver performance test was failing since tolerances needed updating after an earlier MR

Proposed solution

Update tolerances

Implementation

N/A

Tests

Original test

Checklist

• [ ] Functions and classes, or changes to them, are documented.
• [ ] User guide/documentation is updated.
• Changelog is updated.
• Suitable tests added for new functionality.
• Contributed code is correctly formatted. (See the contributing guidelines).
• [ ] License added to any new files.
• No extraneous files have been added (e.g. compiler output or test data files).