[16.0] datev_import_csv_dtvf issue with

[tv-openbig]

File import into a journal with a code written in capital and small letters leads to error message.
For example the code of a journal is "LuG" instead of "LUG"

Module
datev_import_csv_dtvf

Describe the bug

To Reproduce
Take the example file "datev_export.csv" and download it.
Install a german localisation with l10n_de_skr03 module installed.
Put the value "248675,12" in the line 93 of the example file included in the module.
define at least one analytic account with areference "4811".
Modify the journal Miscelleanous short code: MisC
Go to Accounting > Imort DATEV Format .csv
Upload the file
Select the journal Miscelleanous
Force the date: 31.12.2022
Put a reference "test"
Click on "Run import"

Expected behavior
Import should finish and open the account move.
It will work if you change the short code of your journal to "MISC"

The error message is:

List of journal codes that doesn't exist in Odoo:

• MisC line(s): 3,4,5 ....
  all lines are mentioned.

In my example the short code of the journal was "LuG" (mentioned in the error message)

[github-actions]

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