Fix get_step_path_prefix
Fix get_step_path_prefix

The context's workflow ID's key is workflow_id, not workflowId.

Signed-off-by: Yves Bastide <3b1fe340dba76bf37270abad774f327f50b5e1d8@botify.com>

botify-labs/simpleflow,botify-labs/simpleflow