Stop reading the invalid trace in the test

While this wasn't failing the test because we expected the trace
processor to fail, it would cause native crashes that showed up in the
test, which is not ideal and could lead to confusion and false
reportings of protolog issues.

Bug: 434841320
Test: atest TracingTests and make sure we don't see the segfault
Flag: TEST_ONLY
Change-Id: I63d6e64ebef8909ca9455b1c1d8521744691d962