test: fix invalid test

[avivkeller]

The test setup is incorrect:

it('should error on import', async () => {
  try {
    await import(fixtures.fileURL('es-modules/noext-wasm'));
    mustNotCall();
  } catch (err) {
    ok(err instanceof SyntaxError);
  }
});

In the correct setup, mustNotCall() should be invoked as mustNotCall()();. However, the test fails in this case, indicating that the import is actually successful. This PR fixes the invalid test.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.07%. Comparing base (75e4d0d) to head (b5aa5a6).
Report is 540 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #54935   +/-   ##
=======================================
  Coverage   88.06%   88.07%           
=======================================
  Files         651      651           
  Lines      183451   183451           
  Branches    35821    35827    +6     
=======================================
+ Hits       161564   161574   +10     
+ Misses      15133    15130    -3     
+ Partials     6754     6747    -7     

see 23 files with indirect coverage changes

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/62495/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/62527/

[nodejs-github-bot]

Landed in 2a1607c