tests: Invert comments on pattern trailer handling, extend test values

[huntie]

Hey, I've been looking through the tests for this library and spotted something which I'd interpreted differently in the spec. Specifically, the behaviour of pattern trailers for subpath exports, described in more detail here: nodejs/node#39635.

Changes:

• Change the two relevant comments in tests
• Extend test values for subpath exports to include an intermediate subdirectory

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (587b0ba) to head (e0a914b).
Report is 56 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff            @@
##            master       #23   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           51        52    +1     
=========================================
+ Hits            51        52    +1     

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