test: remove tautological service token assertion

scripts/user-profile.test.ts

@@ -311,16 +311,5 @@ async function runFetchUserProfileAfterBodyConsumed(): Promise<{
   assert.match(compose, /SERVICE_TOKEN:\s*\$\{SERVICE_TOKEN:-\}/, "compose SERVICE_TOKEN default must be explicitly empty");
 }
 
-// Config's serviceToken fallback is empty when SERVICE_TOKEN is unset.
-{
-  const savedServiceToken = process.env.SERVICE_TOKEN;
-  try {
-    delete process.env.SERVICE_TOKEN;
-    assert.equal(process.env.SERVICE_TOKEN ?? "", "", "unset SERVICE_TOKEN must resolve to an empty config default");
-  } finally {
-    if (savedServiceToken === undefined) delete process.env.SERVICE_TOKEN;
-    else process.env.SERVICE_TOKEN = savedServiceToken;
-  }
-}
 
 console.log("user-profile: all assertions passed");