Apply suggestions from code review

Co-authored-by: Matej Novotny <matej.novotny2@gmail.com>

extensions/arc/deployment/src/test/java/io/quarkus/arc/test/context/session/SessionContextTest.java

@@ -40,6 +40,7 @@ public void testContexts() {
             sessionContext.activate();
             String id = simpleBean.ping();
             assertEquals(id, client.ping());
+            assertFalse(SimpleBean.DESTROYED.get());
         } finally {
             sessionContext.terminate();
         }