Fix psensor - Missing dependency

Currently I cannot install psensor in trisquel, even if it is in the repos. It fails with the following message:

The following packages have unmet dependencies:
 psensor : Depends: libxnvctrl0 but it is not installable

libxnvctrl0 is built from package nvidia-settings in debian, which is not built in trisquel. The source package in debian seems to me as GPLv2 licensed, but I assume there is a reason for it to be blacklisted.

I have built it with sbuild successfully (configure has a check for the corresponding nvidia headers) and installed it locally in my computer also without issues.

I am using flidas, but I assume this would also be an issue in future nabia and previous belenos. Should I also fill a MR against those branches?

Also, there seems to be no issue filled in the issue tracker so far, but I know more people using it in Ubuntu, so I guess this could be helpful for somebody else.