endo: Some ses-ava static `test` methods don't work

Changing test-message-pattern.js to use ses-ava causes the test.serial at https://github.com/Agoric/agoric-sdk/blob/201cd2d4ed41a41bb9b751a714f99fcd3f6bb303/packages/SwingSet/test/test-message-patterns.js#L123

to fail at https://github.com/Agoric/agoric-sdk/pull/2740/checks?check_run_id=2211691217#step:7:220

  Uncaught exception in test/test-message-patterns.js

  test/test-message-patterns.js:123

   122:   }                                                     
   123:   test.serial('local patterns', testLocalPattern, name);
   124: }                                                       

  Error: Duplicate test title: local patterns