Remove accidental xfail commit from the demo branch

[josh146]

Description of the Change:

The test tests/frontend/test_circuitspecs_gaussianunitary.py::test_non_primitive_gates was accidentally marked xfail on a commit during the demo branch development. This PR reverts that change.

Benefits: additional test will run

Possible Drawbacks: n/a

Related GitHub Issues: n/a

[codecov[bot]]

Codecov Report

Merging #326 into master will not change coverage by %. The diff coverage is 94.97%.

@@           Coverage Diff           @@
##           master     #326   +/-   ##
=======================================
  Coverage   97.66%   97.66%           
=======================================
  Files          50       50           
  Lines        6252     6252           
=======================================
  Hits         6106     6106           
  Misses        146      146           

Impacted Files	Coverage Δ
strawberryfields/circuitspecs/gaussian_unitary.py	100.00% <ø> (ø)
strawberryfields/program_utils.py	95.69% <ø> (ø)
strawberryfields/backends/__init__.py	84.21% <62.50%> (ø)
strawberryfields/program.py	98.84% <87.50%> (ø)
strawberryfields/engine.py	94.55% <87.93%> (ø)
strawberryfields/cli/__init__.py	90.41% <90.41%> (ø)
strawberryfields/api/job.py	93.02% <93.02%> (ø)
strawberryfields/api/connection.py	97.64% <97.64%> (ø)
strawberryfields/api/result.py	100.00% <100.00%> (ø)
strawberryfields/circuitspecs/__init__.py	100.00% <100.00%> (ø)
... and 9 more

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