pw_unit_test: Fix RPC timeout argument

Change-Id: I940568932aec1be2e3d264c30b60536f0f3ddced
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/32121
Pigweed-Auto-Submit: Wyatt Hepler <hepler@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
Reviewed-by: Ewout van Bekkum <ewout@google.com>
diff --git a/pw_unit_test/py/pw_unit_test/rpc.py b/pw_unit_test/py/pw_unit_test/rpc.py
index 5ec0cfd..5644d15 100644
--- a/pw_unit_test/py/pw_unit_test/rpc.py
+++ b/pw_unit_test/py/pw_unit_test/rpc.py
@@ -126,7 +126,7 @@
     test_responses = iter(
         unit_test_service.Run(
             report_passed_expectations=report_passed_expectations,
-            timeout_s=timeout_s))
+            pw_rpc_timeout_s=timeout_s))
 
     # Read the first response, which must be a test_case_start message.
     first_response = next(test_responses)