Switch string for cirque lookup. (#36407)

This is after https://github.com/openthread/ot-br-posix/pull/2574
removed the log line we were looking for.

Co-authored-by: Andrei Litvin <andreilitvin@google.com>

src/test_driver/linux-cirque/helper/CHIPTestBase.py

diff --git a/src/test_driver/linux-cirque/helper/CHIPTestBase.py b/src/test_driver/linux-cirque/helper/CHIPTestBase.py
index ea45a62..a6756b4 100644
--- a/src/test_driver/linux-cirque/helper/CHIPTestBase.py
+++ b/src/test_driver/linux-cirque/helper/CHIPTestBase.py
@@ -143,7 +143,7 @@
         for device_id in devices:
             # Wait for otbr-agent and CHIP server start
             self.assertTrue(self.wait_for_device_output(
-                device_id, "Thread Border Router started on AIL", 10))
+                device_id, "Thread interface: wpan0", 10))
             self.assertTrue(self.wait_for_device_output(
                 device_id, "[SVR] Server Listening...", 15))
             # Clear default Thread network commissioning data