[experiments] DB protocol sub-sets not assigned correctly in simple mode

configuring a new expe from the https://www.beat-eu.org/platform/toolchains/smarcel/vein-recognition-example1/1/

on the DB put vein by default we select in simple mode say "Wrist R" then it can be observed in advanced mode that the sets are not assigned correctly:

Datasets [Reset] train putvein/1/wrist_R/dev_probes

dev_templates putvein/1/wrist_R/test_templates

dev_probes putvein/1/wrist_R/dev_templates

test_templates putvein/1/wrist_R/train

test_probes putvein/1/wrist_R/test_probes

the same issue was observed with other DBs.

Besides the fact that the user should double-check in advanced mode -- it will be great if the fuzzy matching probably used to check the corespondance here works better.