Avoid assertAlmostEqual for python strings

[scpeters]

🦟 Bug fix

Attempted fix for #250

Summary

The Pose3_TEST.py test is failing on arm64 with complaints about subtracting strings in assertAlmostEqual. I believe assertAlmostEqual is not intended for comparing strings. It can occasionally work if they match exactly (see early return on == match), but it fails dramatically if they don't match exactly. This changes two instances of assertAlmostEqual to assertEqual for string comparisons.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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[codecov]

Codecov Report

Merging #255 (012b9fd) into ign-math6 (ac567b5) will not change coverage.
The diff coverage is n/a.

❗ Current head 012b9fd differs from pull request most recent head b3355f0. Consider uploading reports for the commit b3355f0 to get more accurate results

@@            Coverage Diff             @@
##           ign-math6     #255   +/-   ##
==========================================
  Coverage      99.41%   99.41%           
==========================================
  Files             67       67           
  Lines           6347     6347           
==========================================
  Hits            6310     6310           
  Misses            37       37           

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