[QDP] fix test bug

[ryankert01]

Purpose of PR

default has been changed to f32, so the bits result would be 32*2=64 solution: Make the test not init the executor to default, instead init to a predetermined f64

Related Issues or PRs

Closes #733

Changes Made

• [ ] Bug fix
• [ ] New feature
• [ ] Refactoring
• [ ] Documentation
• [ ] Test
• [ ] CI/CD pipeline
• [ ] Other

Breaking Changes

• [ ] Yes
• [ ] No

Checklist

• [ ] Added or updated unit tests for all changes
• [ ] Added or updated documentation for all changes
• [ ] Successfully built and ran all unit tests or manual tests locally
• [ ] PR title follows "MAHOUT-XXX: Brief Description" format (if related to an issue)
• [ ] Code follows ASF guidelines

TODO

• [ ] add a test for original new() fp32, bring back the coverage