Fix merlin errs (#1060)

* fixes for error in merlin tests

* add folder path to copy

Author: jperez999

docker/dockerfile.merlin

@@ -238,7 +238,7 @@ COPY --chown=1000:1000 --from=triton /opt/tritonserver/include include/
 COPY --chown=1000:1000 --from=triton /opt/tritonserver/repoagents/ repoagents/
 COPY --chown=1000:1000 --from=triton /opt/tritonserver/backends/python backends/python/
 # NOTE 2023-07: fil-backend is not available on ARM.
-COPY --chown=1000:1000 --from=triton /opt/tritonserver/backends/fil* backends/
+COPY --chown=1000:1000 --from=triton /opt/tritonserver/backends/fil* backends/fil/
 COPY --chown=1000:1000 --from=triton /opt/tritonserver/backends/tensorrt backends/tensorrt/
 COPY --chown=1000:1000 --from=triton /usr/bin/serve /usr/bin/.
 COPY --chown=1000:1000 --from=triton /usr/lib/*-linux-gnu/libdcgm.so.2 /tmp