Try to fix random CI failures by using a random port in TestCommissioningWindowManager. (project-chip#36255)

Author: bzbarsky-apple

src/app/tests/TestCommissioningWindowManager.cpp

@@ -113,9 +113,8 @@ class TestCommissioningWindowManager : public ::testing::Test
         static chip::SimpleTestEventTriggerDelegate sSimpleTestEventTriggerDelegate;
         initParams.testEventTriggerDelegate = &sSimpleTestEventTriggerDelegate;
         (void) initParams.InitializeStaticResourcesBeforeServerInit();
-        // Set a randomized server port(slightly shifted from CHIP_PORT) for testing
-        initParams.operationalServicePort =
-            static_cast<uint16_t>(initParams.operationalServicePort + chip::Crypto::GetRandU16() % 20);
+        // Use whatever server port the kernel decides to give us.
+        initParams.operationalServicePort = 0;
 
         ASSERT_EQ(chip::Server::GetInstance().Init(initParams), CHIP_NO_ERROR);