Don't discard entity_group when token is the last in the sequence.
Signed-off-by: Morgan Funtowicz <funtowiczmo@gmail.com>
LGTM!

Thanks @mfuntowicz !

Before:

```bash
In [6]: nlp("My name is Wolfgang and I live in Berlin")                                                                                                                                           
Out[6]: [{'entity_group': 'I-PER', 'score': 0.9991481900215149, 'word': 'Wolfgang'}]
````

With this PR:

```bash
In [5]: nlp("My name is Wolfgang and I live in Berlin")                                                                                                                                           
Out[5]: 
[{'entity_group': 'I-PER', 'score': 0.9991481900215149, 'word': 'Wolfgang'},
 {'entity_group': 'I-LOC', 'score': 0.9983668327331543, 'word': 'Berlin'}]
```<|||||>@LysandreJik CI error seems unrelated, is it ok for you if I merge?<|||||>Did you check this, @enzoampil? Just making sure to ping you as you contributed #3957 🤗<|||||>@julien-c Did a few checks as well and looks great! Was planning to include this in this PR #4987 (2nd point), but this seems to solve it cleanly already, so will consider this fix for that PR :smile:

UPDATE: Ended up modifying this fix in the PR above, due to cases where the last token was repeating (for the test cases set in the above PR).