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Change Neutrinet BIC bank account

Closes #14

See merge request !15

Strip bank_id's last char

CSV import create duplicate entries because it relies and the `bank_id`
field to always be the same for a transaction, across exports.

Observations show a transaction always has the same `bank_id` across
exports, **except** for the last char. I haven't found any documentation
about the CSV/bank_id format but looking a the duplicate entries we have
in the database and at entries from a couple of difference CSV exports,
it should fix our issue.