fix(sct.py): Use collector.test_id instead of test_id
fix(sct.py): Use collector.test_id instead of test_id

The test_id is not updated in case it wasn't supplied, but if a test_id
was located via other means, this caused argus to never submit logs due
to it using a null value

scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests