Adjust log line in fuchsia-test-runner.py

* Adjusting log line in `fuchsia-test-runner.py` to refer to self

Author: andrewpollack

src/ci/docker/scripts/fuchsia-test-runner.py

@@ -346,7 +346,7 @@ def start(self):
                 "-f",
                 self.ssh_keyfile_path(),
                 "-C",
-                "Generated by test_toolchain.py",
+                "Generated by fuchsia-test-runner.py",
             ],
             stdout=self.subprocess_output(),
             stderr=self.subprocess_output(),