Remove our own trim() function from a TAP test

[jeltz]

The rest of the TAP tests uses the Text::Trim module, so let's do that for this test too.

PG-0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.25%. Comparing base (53c16a4) to head (02f511c).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #781      +/-   ##
==========================================
+ Coverage   88.10%   88.25%   +0.15%     
==========================================
  Files           3        3              
  Lines        1320     1320              
  Branches      190      190              
==========================================
+ Hits         1163     1165       +2     
+ Misses         77       76       -1     
+ Partials       80       79       -1     

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