Duplicate tests entry in menu

[cedelavergne-ledger]

When a (ragger) test uses fixture or parametrize fature, the parsing doesn't parse it correctly, leading to duplicate entries.
For example, using app-nbgl-tests, we have the following result:

    "test_keypad",
    "test_keypad",
    "test_get_app_and_version",
    "test_navigation",
    "test_navigation",
    "test_navigation",
    "test_navigation",
    "test_navigation",
    "test_spinner"