Drop explicit --agent_path argument in tests
Drop explicit --agent_path argument in tests

Now that Jazzer uses the runfiles library to locate the agent jar, this
argument is no longer required.

CodeIntelligenceTesting/jazzer,CodeIntelligenceTesting/jazzer,CodeIntelligenceTesting/jazzer,CodeIntelligenceTesting/jazzer,CodeIntelligenceTesting/jazzer