[FIX] Fix type mismatch in clinica.iotools.bids_utils

[NicolasGensollen]

Closes #1375

[AliceJoubert]

LGTM, thanks @NicolasGensollen !

[NicolasGensollen]

This is still buggy, changing to draft...

[AliceJoubert]

Don't know if that would help you in this PR but I looked up what a bad line would be. Here is an example :
bad_line = ['618', '1', 'm18', '1', '08/06/2014', ... , '1', '1', 'measured', 'AUSTIN AC CT Brain H19s', '0']. The code is trying to get rid of the two keys 'measured' and 'AUSTIN...' (these are always the same) and replace them with one key '-4'.

[NicolasGensollen]

Thanks @AliceJoubert
I just wanted to fix the type error described in the linked issue.
I'm assuming the logic is correct. I reverted to draft because the conditional assignment of the lambda functions wasn't working as expected. It should be good now.

[AliceJoubert]

I checked with the latest clinical data from AIBL and it works as it should ! If you want to merge @NicolasGensollen

[NicolasGensollen]

Thanks for the review @AliceJoubert !