fix ThriftContextPropHandlerTest

Summary:
This test was consistently failing when running on my devserver because it was filling in the user ID in the baggage property automatically.

Updating this test to explicitly clear baggage makes it pass again

Reviewed By: shuyang790

Differential Revision: D73464679

fbshipit-source-id: be0515db37624b650fc982ebf526ce5b398407af

Author: Nathan Maue

third-party/thrift/src/thrift/lib/hack/src/__tests__/ThriftContextPropHandlerTest.php

@@ -65,6 +65,7 @@ public function testValueNull(): void {
     ThriftContextPropState::get()->setRequestId(null);
     ThriftContextPropState::get()->setOriginId(null);
     ThriftContextPropState::get()->setPrivacyUniverse(null);
+    ThriftContextPropState::get()->setBaggage(null);
     $v = ThriftContextPropHandler::makeV();
     expect($v)->toBeNull();