Resuming Externalized Checkpoint E2E test does not resume from Externalized Checkpoint

Path to externalized checkpoint is not passed as the -s argument:
https://github.com/apache/flink/blob/483507a65c7547347eaafb21a24967c470f94ed6/flink-end-to-end-tests/test-scripts/test_resume_externalized_checkpoints.sh#L128

That is, the test currently restarts the job without checkpoint.