Resolve failing FBBT tests

[michaelbynum]

Summary/Motivation:

A few of the FBBT tests are failing due to floating point comparisons. They are off in the 16th digit. This PR adds a small tolerance to make the tests more robust.

Legal Acknowledgement

By contributing to this software project, I have read the contribution guide and agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the BSD license.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[codecov]

Codecov Report

Merging #2244 (1e90d7c) into main (593735b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2244   +/-   ##
=======================================
  Coverage   83.05%   83.05%           
=======================================
  Files         607      607           
  Lines       76968    76968           
=======================================
  Hits        63923    63923           
  Misses      13045    13045           

Flag	Coverage Δ
linux	80.33% <ø> (-0.01%)	⬇️
osx	70.59% <ø> (-0.03%)	⬇️
other	80.27% <ø> (-0.03%)	⬇️
win	77.40% <ø> (-0.03%)	⬇️

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