Remove unnecessary barrier in test

[bhazelton]

Description

Motivation and Context

fixes #348

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Reference simulation update or replacement
• [ ] Documentation change (documentation changes only)
• [ ] Version change
• [ ] Build or continuous integration change

Checklist:

For all pull requests:

• [x] I have read the contribution guide.
• [x] My code follows the code style of this project.

Bug fix checklist:

• [ ] My fix includes a new test that breaks as a result of the bug (if possible).
• [x] All new and existing tests pass.
• [ ] I have checked that I reproduce the reference simulations or if there are differences they are explained below (if appropriate). If there are changes that are correct, I will update the reference simulation files after this PR is merged.
• [ ] I have checked (e.g., using the benchmarking tools) that this change does not significantly increase typical runtimes. If it does, I have included a justification in the comments on this PR.
• [ ] I have updated the CHANGELOG.

[codecov[bot]]

Codecov Report

Merging #382 (fd8376e) into main (1f88b96) will decrease coverage by 0.00%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #382      +/-   ##
==========================================
- Coverage   99.17%   99.17%   -0.01%     
==========================================
  Files          13       13              
  Lines        2054     2053       -1     
==========================================
- Hits         2037     2036       -1     
  Misses         17       17              

Impacted Files	Coverage Δ
pyuvsim/uvsim.py	98.56% <ø> (-0.01%)	:arrow_down:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 1f88b96...fd8376e. Read the comment docs.