Remove a left-over TODO statement

[cescoffier]

The test mentioned in the TODO has been implemented in a previous PR.

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 90d1602.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

You can consult the Develocity build scans.

---

Flaky tests - Develocity

⚙️ JVM Tests - JDK 21

📦 integration-tests/oidc-code-flow

✖ io.quarkus.it.keycloak.CodeFlowTest.testTokenRefresh - History

• expected: <true> but was: <false> - org.opentest4j.AssertionFailedError

org.opentest4j.AssertionFailedError: expected: <true> but was: <false>
	at io.quarkus.it.keycloak.CodeFlowTest$3.call(CodeFlowTest.java:733)
	at io.quarkus.it.keycloak.CodeFlowTest$3.call(CodeFlowTest.java:720)
	at org.awaitility.core.CallableCondition$ConditionEvaluationWrapper.eval(CallableCondition.java:99)
	at org.awaitility.core.ConditionAwaiter$ConditionPoller.call(ConditionAwaiter.java:248)
	at org.awaitility.core.ConditionAwaiter$ConditionPoller.call(ConditionAwaiter.java:235)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)