SubjQA wrong boolean values in entries
## Describe the bug
SubjQA seems to have a boolean that's consistently wrong.

It defines:
- question_subj_level: The subjectiviy level of the question (on a 1 to 5 scale with 1 being the most subjective).
- is_ques_subjective: A boolean subjectivity label derived from question_subj_level (i.e., scores below 4 are considered as subjective)

However, `is_ques_subjective` seems to have wrong values in the entire dataset.

For instance, in the example in the dataset card, we have:
- "question_subj_level": 2
- "is_ques_subjective": false

However, according to the description, the question should be subjective since the `question_subj_level` is below 4

Hi @arnaudstiegler, thanks for reporting. I'm investigating it. @arnaudstiegler I have just checked that these mismatches are already present in the original dataset: https://github.com/megagonlabs/SubjQA

We are going to contact the dataset owners to report this. I have:
- opened an issue in their repo: https://github.com/megagonlabs/SubjQA/issues/3
- written an email to all the paper authors Please [see my response](https://github.com/megagonlabs/SubjQA/issues/3#issuecomment-905160010). There will be a fix in a couple of days.